Phoenix Integrative and Naturopathic Medicine Blog

Does Testosterone Affect Your PSA?

Dr. Robin Terranella — Sun, 19 Jul 2026 17:00:00 GMT

Does Testosterone Affect Your PSA?

Posted by Dr. Robin Terranella

If you're starting testosterone replacement therapy or you've been on it for a while, you've probably wondered whether TRT is going to raise your PSA — and if so, whether that's something you should worry about. Short answer: yes, testosterone almost always raises PSA given enough time. The longer answer involves the actual mechanism, the timeline I see in patients, and a few situations where PSA might not budge at all. Let's walk through it.

The Short Answer: Yes

Testosterone almost always raises PSA, given enough time. There are some small studies showing PSA doesn't rise on testosterone administration, but the better-designed studies do show PSA going up after TRT starts. In my own practice, I commonly see PSA rise after a patient starts TRT.

That doesn't mean every patient sees a dramatic jump. And it doesn't happen instantly — give it enough time, because one shot or one month usually isn't going to move the number meaningfully. But over the course of months, the trajectory is up.

Why It Happens — The Mechanism

PSA stands for prostate specific antigen. The "antigen" piece is just a fancy word for a protein. PSA is a protein produced by prostate tissue. So the amount of PSA in your blood largely reflects the amount of prostate tissue you have. More tissue = more PSA.

Where TRT comes in: testosterone increases the body's production of two other hormones that act directly on prostate tissue — estradiol and dihydrotestosterone (DHT). Both of these cause prostate cells to grow and divide, producing new prostate cells. More cells, more total prostate tissue, more PSA. That's the chain.

This connects to a broader point: with age, both PSA and prostate size generally increase. Some of that natural rise is thought to reflect lifelong exposure of prostate tissue to testosterone, DHT, and estradiol. Adding exogenous testosterone accelerates that exposure.

The Timeline I See In Practice

The pattern I see most commonly: an initial spike a few months after starting TRT, then a stabilization. After the early rise, PSA tends to settle into the normal age-trajectory line and continues climbing slowly with age — much like it would have without TRT, just from a slightly higher starting point.

So the question isn't really "will TRT permanently elevate my PSA" — it's more like "will TRT push my PSA up to where age-related rise was going to take it anyway, faster." For most patients on a stable, monitored protocol, the PSA finds its new baseline and behavior tracks normally from there. It might rise again gradually over the next two to three years, then stabilize again.

The Topical Exception

One scenario where TRT may not raise PSA at all: poorly absorbed topical testosterone. If you're applying testosterone cream and a meaningful fraction isn't actually getting into your bloodstream — which is a common problem with topicals — your hormones may not actually be moving much. No real testosterone elevation means no real DHT or estradiol elevation, which means no real prostate effect.

So if you're on a topical and your PSA isn't budging, that may be reassuring on the prostate side — but it should also raise the question of whether the testosterone is doing anything at all. Patients on topicals who aren't feeling the expected changes in energy, libido, and recovery often have an absorption problem, and the unchanged PSA can be a clue. The fix is usually to switch to injectable or to address whatever's blocking absorption.

What This Means For Monitoring

If you're on TRT, expect PSA to rise. That's normal and not by itself a sign of a problem. What matters is the pattern:

Initial rise then stabilization over months — typical, expected, generally fine
Slow age-related rise after stabilization — typical, just track it
Sudden or rapid rise after a previously stable period — that's worth investigating with your doctor; a urology workup may be indicated
No change at all on a topical — possible absorption problem; check whether the TRT is actually working

The "does PSA even matter" debate — whether routine PSA screening is the right approach in the first place — is a separate question worth its own discussion. What this post is about is the relationship between TRT and the number itself.

Bottom Line

Yes, testosterone affects your PSA. Almost always up, given enough time. The mechanism is straightforward — more prostate tissue produces more PSA, and TRT drives the hormones that grow prostate tissue. The pattern is usually an initial spike, then stabilization on the normal age-trajectory. Topical testosterone with poor absorption may not move PSA at all — which can be a hint the TRT itself isn't working. Don't assume any rise is a problem; do track the pattern, and don't ignore sudden changes after a stable period.

For a complete protocol on starting and managing TRT — including how to interpret PSA, hematocrit, and estradiol changes — check out the Mastering Your TRT ebook or use the TRT Optimization App. Or work with me directly for a personalized plan.

Topics: TRT, Testosterone, PSA, Prostate, DHT, Estradiol, Men's Health

The Truth About High Folate Blood Tests

Dr. Robin Terranella — Sun, 12 Jul 2026 17:00:00 GMT

The Truth About High Folate Blood Tests

Posted by Dr. Robin Terranella

If you're looking at your blood work and seeing your folate level flagged as "high," you might be wondering whether that's a problem. The short answer: no, in almost all cases it's not. The longer answer involves understanding what the standard serum folate test is actually measuring (and not measuring), why almost everyone runs high, and which folate test is more useful if you actually want to know your status. Here's the breakdown.

Most People Run "High" — And It's Mostly Meaningless

The standard folate test is a serum folate. Almost everybody has an elevated serum folate level. Honestly, in clinical practice I don't think I've ever seen one that wasn't on the high side. So when "high" is the default for the entire population, the result loses its diagnostic value.

The reason it runs high in almost everyone is straightforward: folic acid is everywhere in the modern food supply. Rice, breads, cereals, pastas — most grain-based foods are fortified with folic acid. Add a multivitamin (most contain folic acid) or any folate supplement and the number climbs further. So a "high" serum folate mostly reflects ambient food fortification, not your underlying status.

The Test Doesn't Distinguish Between Forms

Here's the bigger limitation: the standard serum folate test doesn't distinguish between folic acid, methylfolate, folinic acid, and the various intermediary metabolites. It just gives you one number for "folate." But these forms behave very differently in the body.

Folic acid is synthetic. It needs to be converted in the liver to be useful. People with MTHFR variants can struggle with this conversion.
Methylfolate (5-MTHF) is the active form your cells actually use.
Folinic acid (5-formyl-THF) is another reduced form that's used in certain pathways.

So a high serum folate could mean you're getting plenty of usable methylfolate — or it could mean your serum is full of unconverted folic acid your cells can't actually use. The test alone doesn't tell you which.

Is High Folate Actually Dangerous?

There's a theoretical concern about high folate masking B12 deficiency — meaning the high folate can correct the anemia of B12 deficiency on labs while neurological damage continues underneath. That concern is real, but only matters if you actually have a B12 deficiency. If your B12 is adequate, high folate isn't a problem in itself.

The more practical caution: large doses of methylfolate can cause real symptoms in some people — agitation, anxiety, headaches, sleep disturbances. Read more on methylfolate side effects here. Folic acid doesn't seem to cause those same symptoms in the same way. So if you're considering supplementing with methylfolate specifically, start low — much lower than people often think.

The Better Test: RBC Folate

If you want a more accurate measurement of your folate status — one that actually reflects what's getting into your cells over time — the test to ask for is red blood cell folate (RBC folate). It's not as susceptible to the rises and falls of a recent supplement or meal because red blood cells live for about 120 days. The RBC folate gives you a longer-term picture of folate availability inside cells, which is much more useful clinically.

It's also worth doing folate testing in a fasting state if possible, for the same reason — recent food or supplement intake can spike serum folate and obscure the underlying picture.

What I Look At Instead Or Alongside

For most patients, I don't rely heavily on the serum folate alone. I'd rather see:

RBC folate — the cellular folate level
MCV — if it's elevated, it suggests impaired DNA synthesis (often a sign that folate or B12 utilization is compromised, regardless of what the serum says)
Homocysteine — if elevated, it points to compromised methylation, which usually involves folate/B12
B12 and methylmalonic acid — to make sure B12 status is solid before drawing any conclusions about folate

This combination gives a much more useful picture than a single "your folate is high" flag on a report.

Bottom Line

A high serum folate result, by itself, isn't typically a problem. It usually reflects food fortification more than anything else, and the test can't distinguish between the various forms of folate. The more useful tests are RBC folate, MCV, and homocysteine — those will give you a real picture of whether your folate (and methylation more broadly) is doing what it should. Don't change your supplements based on a "high folate" flag alone. Look at the bigger picture.

For a deeper dive into folate, B12, and the methylation cycle — including how to use methylfolate safely if you have MTHFR variants — check out my book "Don't B12 Deficient". Or work with me directly to interpret your labs and build a methylation plan.

Topics: Folate, Folic Acid, Methylfolate, RBC Folate, B12, Methylation, Blood Tests

MTHFR: The Truth Behind Overmethylation vs Undermethylation Symptoms

Dr. Robin Terranella — Sun, 05 Jul 2026 17:00:00 GMT

If you've been reading about MTHFR and methylation online, you've probably encountered the categories of "overmethylation" and "undermethylation" symptoms. The framework gets used as a quick diagnostic — feel anxious? overmethylating, avoid methyl donors. Feel depressed? undermethylating, take more. The reality is more complicated. The framework can be useful, but it isn't a biochemical truth — and treating it like one leads to mistakes. In this post we'll work through what's actually going on and how to use these categories appropriately.

What Methylation Actually Is

When we talk about methylation, we're referring to the addition of a methyl group (one carbon plus three hydrogens) to another molecule. Methyl donors — folate, methylfolate, methyl B12, SAMe — supply those groups. Methylation is involved in everything from DNA expression to neurotransmitter synthesis to detoxification.

Here's the catch most popularizations miss: methylation isn't a single global on/off switch. It's an intricate, regulated process with feedback loops. Taking SAMe or methylfolate doesn't automatically increase methylation everywhere in your body uniformly. Your body responds to the level of SAMe, the level of homocysteine, environmental drivers of epigenetic changes, and various other cellular signaling pathways. Some pathways might increase, others might compensate by decreasing, the net effect depends on what your body actually needed.

So when someone says "I'm overmethylated" or "I'm undermethylated," what they usually mean is that their symptoms feel a certain way — not that any specific biochemical state has been measured. That's not a problem in itself. It just means we should treat the framework for what it is: a symptom-based heuristic, not a diagnosis.

Where The Framework Comes From

The original idea was described in the context of mental health by Dr. William Walsh. The classic framing:

Overmethylation symptoms: anxiety, hyperactivity, obsessive-compulsive tendencies
Undermethylation symptoms: depression, oppositional behavior, low motivation

The intuition is that someone in a more "depressive, low-motivation" state might benefit from more methyl donors, while someone in a more "anxious, wired" state might benefit from fewer. There's clinical signal in this — but it's not as clean as it sounds.

Why Symptoms Alone Aren't Reliable Diagnostics

Here's where it gets messy. People aren't one symptom category. Someone can be depressed and anxious and obsessive at the same time. Someone with chronic fatigue can have all four. The framework presumes a clean phenotype that often doesn't exist clinically.

And it doesn't always predict response to treatment cleanly either. In my practice, I do see general patterns — patients with the more depressive, low-energy presentation tend to do better on methyl donors, and patients with prominent anxiety tend to have a harder time tolerating them. But "tend to" is the key phrase. It's not universal. I've had anxious patients respond beautifully to low-dose methylfolate, and I've had depressed patients get more agitated on it. The principle is useful as a guide; it falls apart when treated as a rule.

Objective Markers I Use Alongside Symptoms

To make better decisions, I lean on lab markers that give an objective handle on methylation status — independent of how the patient says they feel. The most useful:

MCV (mean corpuscular volume). When this trends elevated, it suggests impaired DNA synthesis — which often points to a need for more methyl donors (B12, folate, methylfolate).
Homocysteine. Elevated homocysteine is a downstream marker of compromised methylation. Bringing it down often involves methyl B12 + methylfolate + B6.
Serum and RBC folate. Helps clarify whether the issue is intake/absorption or utilization.
Serum and active B12 (or methylmalonic acid as a functional marker). Same principle.

If MCV is high and homocysteine is high in a patient with depressive symptoms, methyl donors are very likely to help. If both are normal in a patient who's anxious and wired, more methyl donors are unlikely to be the answer regardless of how the over/under framework labels them.

The Practical Approach

Use the framework as a starting hypothesis, not a final answer. Here's how I work with it:

Look at the symptom picture — is it more depressive/low-energy or anxious/agitated?
Run the labs (MCV, homocysteine, folate, B12, plus the patient's general metabolic and inflammation markers)
If the labs agree with the symptom picture, you have a stronger signal — proceed with appropriate dosing
If the labs disagree, dig deeper before changing methyl donor strategy. Sometimes there's a confounder (gut absorption, MTHFR genetics, other deficiencies)
Re-evaluate after a few weeks. Don't lock in your category — methylation states shift with stress, illness, diet

What works for one person doesn't always work for the next, even with apparently identical genetics. The framework's value is in helping you ask the right questions, not in handing you the answer.

Bottom Line

Overmethylation vs undermethylation is a useful symptom-based heuristic, originally described by Dr. William Walsh. It captures real patterns I see in practice — but it's not a biochemical truth, and using it as a strict diagnostic leads people astray. Pair the symptom picture with objective markers (MCV, homocysteine, folate, B12), reassess regularly, and remember that each person's biochemistry is different. The goal isn't to "be" overmethylated or undermethylated — it's to give your body what it actually needs and let it find balance.

For more on the methylation cycle, MTHFR genetics, and how to use methyl donors safely — including the specific dosing principles I use with patients — check out my book "Don't B12 Deficient". Or work with me directly to interpret your labs and personalize the approach.

Topics: MTHFR, Methylation, Overmethylation, Undermethylation, Methyl Donors, SAMe, Methylfolate, Mental Health

Chronically High EBV IgM Antibodies: What They Mean

Dr. Robin Terranella — Sun, 28 Jun 2026 17:00:00 GMT

If you had mono months ago and your EBV IgM antibodies are still positive, or worse, still climbing, it's natural to wonder what's going on. This came up from a reader who had mono four months earlier, retested, and found their IgM antibodies hadn't just lingered, they'd increased. In this post we'll walk through what high or rising EBV IgM means, how long these antibodies normally stay up, how your symptoms help interpret the number, and when it actually points to chronic Epstein-Barr.

What High EBV IgM Actually Signals

Elevated or high EBV IgM antibodies point to one of three things. First, an acute Epstein-Barr infection, the virus is active right now. Second, a reactivation, the virus had gone dormant and is coming back. Third, lingering antibodies from a recent acute infection, where the infection is fading but the IgM hasn't cleared yet.

That third scenario is common and often misread. After your body has already started overcoming the virus, the antibodies can stick around for a couple of months. So a positive IgM doesn't automatically mean the infection is still raging, it may just be the tail end. For the broader question of whether the virus is currently active, see how to tell when EBV is active.

How Long IgM Normally Stays Up

Typically, IgM antibodies stay high for a few months after the infection. Four months is getting toward the long end of that window. So if you're at four months and the number actually went up rather than down, that does suggest the process is running longer than we'd usually expect.

But it's not a reason to panic. These numbers can shift quickly. Even a value that just increased can be on its way down a week or two later. One snapshot in time tells you less than the trend across a couple of retests.

Let Your Symptoms Interpret the Number

This is where your symptoms do a lot of the work. If you still have fever, swollen lymph nodes in your neck or elsewhere, an enlarged spleen (which takes imaging to confirm), or severe fatigue, the kind where it's hard to get out of bed, that suggests your body is still actively fighting the virus and the infection is genuinely ongoing.

On the other hand, if you're largely asymptomatic, or simply getting better week by week, that points the other way: the virus is on its way out, and what you're seeing on the lab is just lingering antibodies. There's also an in-between phase where you're improving but the antibodies are hanging on longer than they usually would.

Why People Respond So Differently

A typical EBV or mono infection lingers symptom-wise for about a month or two, then starts to ease. But the range is wide. Some people are over it in a couple of weeks. Some never have a noticeable acute infection at all. That variation likely comes from a mix of your own genetics and the genetics and virulence of the particular virus. The honest answer is that we don't fully know why some people clear it fast while others reactivate.

When It Becomes Chronic EBV

Sometimes IgM antibodies stay high for six months, twelve months, or even several years. Once it pushes past about six months, that's generally when we start calling it chronic Epstein-Barr virus.

One thing worth understanding: Epstein-Barr is a herpes-family virus. Once you've been exposed, that kind of virus lives in your body for good, which is why your IgG test will stay positive permanently. The IgM is the one that normally turns negative within two to four months. Give it a margin of error of a few weeks to a month, since everyone clears it a little differently.

How Chronic EBV Is Actually Diagnosed

Diagnosing chronic EBV is far from black and white. There's no single number that settles it. It takes a combination: lab testing across the relevant antibodies, your current symptoms (which may be waxing and waning), ruling out other conditions that could explain how you feel, and the long-term overall clinical picture. If you want help reading the full antibody panel, the post on what a positive Epstein-Barr test means breaks the markers down.

Bottom Line

High or rising EBV IgM after mono isn't automatically alarming. It can mean active infection, reactivation, or just antibodies that haven't cleared yet, and your symptoms are the best guide to which. IgM usually fades within two to four months; past six months it leans toward chronic EBV. Track the trend, not a single result, and weigh it against how you actually feel.

If you're dealing with ongoing fatigue and a confusing EBV panel and want help interpreting it, work with me directly to build a plan around your specific labs and symptoms.

Topics: EBV, Epstein-Barr Virus, IgM, Chronic EBV, Mono, Fatigue, Antibodies

These Are The Stages Of Fatty Liver Disease

Dr. Robin Terranella — Sun, 21 Jun 2026 16:59:59 GMT

If you've recently been told you have fatty liver — often as an incidental finding on an ultrasound done for something else — the first thing to know is this isn't a single condition. It's a spectrum. Where you are on that spectrum determines how reversible it is and what you need to do about it. In this post we'll break down the four stages of non-alcoholic fatty liver disease (NAFLD), what blood work and imaging look like at each stage, and the single most important driver to manage if you want this to reverse.

What Fatty Liver Disease Actually Is

NAFLD — non-alcoholic fatty liver disease — is a broad term covering a range of conditions characterized by accumulation of fat in the liver cells (hepatocytes). The "non-alcoholic" part is key: while some people with NAFLD also drink, this condition develops from non-alcohol-related causes. It's tightly tied to metabolic risk factors — obesity, insulin resistance, metabolic syndrome, diabetes. Even just having increased abdominal girth raises your risk.

This is very common in the modern population. Not normal — but common. Most people find out about it after an unrelated abdominal ultrasound shows fatty liver as an incidental finding. If that happened to you, the first step isn't panic; it's figuring out which stage you're in.

Stage 1: Steatosis

Steatosis is the earliest and mildest form. Excess fat is accumulating in liver cells without significant inflammation or cell damage. There may be some early damage starting, but it's not pronounced.

The good news: steatosis is generally considered reversible. It doesn't progress in everyone, especially if you address the underlying drivers. The mechanism is mostly about insulin resistance and triglyceride handling. Carbs get stored as glycogen first; once glycogen stores are full, the body converts the excess into triglycerides. Some triglyceride gets exported and stored in fat tissue, but if there's still too much for the body to handle, some of it gets stored as fat right in the liver. That's what shows up on the ultrasound.

The intervention at this stage is straightforward: keep your insulin resistance numbers in check, watch your triglycerides, and the fat accumulation comes down.

Stage 2: NASH (Non-Alcoholic Steatohepatitis)

NASH is more advanced. It's still fat in the liver — but now there's also inflammation and actual liver cell damage. Steato (fat) + hepa (liver) + itis (inflammation). The inflammation pattern resembles alcohol-related liver damage, which is why I've seen so many patients told for years to stop drinking even though they don't drink at all. The labs look the same. The driver is different.

What's happening: those excess triglycerides are now damaging liver cells. When cells die, their contents — including liver enzymes — leak into the bloodstream. That's the elevated liver enzymes (ALT, GGT, AST) you see on labs.

Important: elevated liver enzymes alone don't equal NASH — there are many other causes. But elevated liver enzymes plus imaging showing fatty liver does strongly suggest NASH. This stage is still reversible, but the window is narrower than at stage 1, and the seriousness of the situation is real. If you're seeing rising ALT or GGT alongside a fatty liver finding, that's the moment to get serious about insulin resistance.

Stage 3: Fibrosis

Fibrosis is scar tissue forming in response to ongoing damage. The cells keep getting damaged, the body can't keep up with repair, so it lays down scar tissue instead. Once scar tissue forms, it's much harder to reverse — and beyond a certain point, it doesn't reverse at all. The liver is a remarkably regenerative organ, but only up to a point. Once fibrosis is extensive, the liver can't keep up with the body's demands.

Fibrosis usually develops after years of NAFLD with elevated liver enzymes. It's checked with a special type of liver ultrasound (fibroscan / transient elastography) which can stage how much fibrotic tissue is present. Liver biopsy is another option, but it's rarely done these days because the imaging is good enough.

Stage 4: Cirrhosis

Cirrhosis is the most advanced stage — permanent scarring across enough of the liver that function is meaningfully compromised. At this stage you may still see elevated liver enzymes, or sometimes you don't (the liver isn't producing as much). What you'll start to see instead are downstream signs: lower platelet counts, decreased clotting factors, decreased blood proteins (because the liver makes those). Portal hypertension can develop, which can cause swelling in the abdomen and legs.

This is the stage where reversal isn't on the table — the goal becomes preventing further decline.

What To Do If You Have Fatty Liver

The most important target is keeping your insulin resistance markers under control — and doing it consistently for long stretches, not in short bursts. Triglycerides, fasting glucose, A1c, fasting insulin all matter. The tighter you keep these, the less fat ends up in the liver and the less damage occurs.

Concretely: I want liver enzymes under 25. The standard "normal" range goes much higher than that — but at 25 or below you have meaningful margin from active inflammation. And even when one test looks fine, the underlying insulin resistance markers still need to be normal.

Pay particular attention to fructose. Fructose is processed in the liver and can be especially damaging to liver cells. That means high-fructose corn syrup, sweetened drinks, and even some high-fructose fruits add up. This isn't an "all sugar is bad" message — it's a "fructose specifically punches above its weight on liver damage" message.

It's also worth checking iron. Inflammation in the liver can drive iron accumulation, showing up as elevated ferritin. Elevated iron can in turn worsen liver damage — so the two often feed each other.

Bottom Line

Fatty liver isn't a single thing. Steatosis is reversible. NASH is reversible if you act. Fibrosis becomes increasingly hard to reverse. Cirrhosis is permanent. The earlier in the spectrum you catch this, the more leverage you have. Get the imaging, get the liver enzymes, and look hard at insulin resistance. The labs that don't seem related — fasting insulin, triglycerides, A1c — are the ones that drive what's happening in the liver.

If you're seeing elevated liver enzymes alongside fatty liver, glutathione is one of the supplements I most often recommend to support liver detoxification. Here's the one I use with patients. Or work with me directly to build a treatment plan around your specific labs.

Topics: Fatty Liver, NAFLD, NASH, Cirrhosis, Insulin Resistance, Liver Enzymes, Triglycerides, Fibrosis

Symptoms Of Thiamine Deficiency

Dr. Robin Terranella — Sun, 14 Jun 2026 16:59:59 GMT

If you're dealing with ongoing fatigue, heart palpitations, numbness or tingling, or memory issues, thiamine deficiency might be on your differential — even if you'd never think of it. Most people assume thiamine (vitamin B1) deficiency is a third-world problem, but it shows up in modern diets more than people realize, especially in diabetics, in heavy carb consumers, and in anyone with chronic alcohol intake. In this post we'll walk through how thiamine deficiency presents, the systems it affects most, and the situations where it's most likely to develop.

What Thiamine Actually Does

Thiamine works as a cofactor for enzymes that break down carbohydrates — and to a lesser extent amino acids and fatty acids — into usable energy. The most important of those enzymes is pyruvate dehydrogenase, which sits at a critical step in glucose metabolism. Without thiamine, that enzyme doesn't work efficiently. Glucose can't be properly broken down. Instead, the body shuttles excess glucose into making triglycerides, which then get stored as fat.

This is why people who eat a lot of carbohydrates have a higher thiamine requirement. The more glucose coming in, the more thiamine you need to process it. Diabetics, in particular, often run low on thiamine — high blood glucose plus impaired metabolism means thiamine demand outstrips supply over time. (If a diabetic reduces glucose intake, thiamine demand drops too.)

The Symptoms — and Why They're Vague

Day-to-day, mildly reduced thiamine intake won't be noticeable. But over the long term, the systems that depend most on cell turnover and constant energy production start to suffer. The result is a symptom cluster that's frustrating to diagnose because it overlaps with so many other things.

Fatigue and Cognitive Effects

Energy and brain function take an early hit. Fatigue and weakness are common. As the deficiency progresses, cognitive symptoms start showing up — confusion, memory impairment, irritability, emotional instability. The mechanism: the nervous system needs huge amounts of ATP to send signals back and forth between neurons. When thiamine is short, ATP production falters. Nerve signals weaken. Neurotransmitter production drops. Eventually neurons themselves can deteriorate.

Numbness, Tingling, Walking Problems

The peripheral nervous system is particularly susceptible. Numbness and tingling in extremities, difficulty walking, sometimes muscle weakness — these are classic neurological signs of thiamine deficiency. They develop gradually, which is why patients often attribute them to age, posture, or other causes.

Heart Palpitations and Cardiovascular Effects

The cardiovascular system also depends on thiamine for ATP production — the heart muscle needs energy for every contraction, and the electrical conducting system needs energy for every signal. When thiamine is low:

Increased heart rate and palpitations are early signs
The heart muscle's contractility weakens — it can't pump as forcefully
In severe cases, the heart can enlarge (cardiomyopathy) and progress to heart failure
Electrolyte balance across cell membranes can shift, leading to arrhythmias

If you're seeing unexplained palpitations or new arrhythmias and your standard workup is normal, thiamine deficiency is one of the things worth ruling out — particularly if you also fit one of the high-risk categories below.

GI Symptoms

Loss of appetite, nausea, vomiting, abdominal pain — thiamine deficiency affects the contractility and motility of the digestive tract. This becomes a tricky diagnostic loop: the GI symptoms can drive someone to restrict their diet, the restriction worsens the thiamine deficiency, and the deficiency keeps the GI symptoms going. Patients sometimes go in circles for years on this without catching the actual cause.

Severe Cases: Beriberi and Wernicke's

In really advanced thiamine deficiency, you can see beriberi. Two main types:

Wet beriberi — cardiovascular focus. Rapid heart rates, swelling in the extremities (from heart failure and circulation problems), eventually heart failure itself.
Dry beriberi — neurological focus. Peripheral neuropathy, weakness, muscle cramping.

Cases this severe are uncommon today in developed countries. But there's a more dangerous picture related to alcohol: Wernicke's encephalopathy, which can occur in chronic alcohol use. Wernicke's presents with confusion, ataxia (inability to coordinate movements), eye movement abnormalities, and in severe cases coma. Korsakoff's syndrome — a related, more chronic form — adds memory disturbances. These are medical emergencies and are the reason thiamine is given empirically to anyone admitted with alcohol withdrawal or unexplained altered mental status.

Who's Actually At Risk Today

The classic high-risk groups in modern populations:

Heavy carbohydrate consumers — high glucose load = high thiamine demand
Diabetics — for the same reason; mild thiamine deficiency is common in poorly controlled diabetes
Chronic alcohol use — alcohol depletes thiamine and interferes with the enzymes that need it; this is one of the most common causes of clinically significant deficiency
Restricted diets — especially those avoiding fortified grains and cereals. Thiamine is fortified into bread, pasta, and breakfast cereals in most developed countries; if you've moved off those, you may be getting much less than you'd assume
People with persistent GI dysfunction — absorption is compromised

Modern dietary trends — gluten-free, keto, carnivore, plant-based without supplementation — can move people out of fortified grain consumption and into low-thiamine territory. This is often missed because the assumption is "fortified food, you're fine." Once someone leaves that food group, they're not.

What To Do If You Suspect Thiamine Deficiency

The diagnosis can be made by blood test (whole blood thiamine, or transketolase activity is more sensitive). But thiamine is also generally low-risk to supplement, so empirical replacement is reasonable in someone whose symptoms fit. A few practical points:

If you're a diabetic with fatigue and neuropathy, thiamine deserves consideration — separate from the diabetic neuropathy diagnosis itself
If you're on a restrictive diet (gluten-free, paleo, carnivore, low-carb), and you've moved off fortified grains, consider whether you're getting thiamine from other sources (pork, sunflower seeds, legumes, eggs, fish)
If alcohol is a meaningful part of the picture, addressing that is the highest-leverage intervention; supplementation alone won't keep up with active alcohol depletion
If symptoms include neurological signs (confusion, ataxia, eye movement abnormalities), this is urgent and requires medical evaluation, not self-treatment

Bottom Line

Thiamine deficiency isn't just a historical or third-world problem — it shows up in modern populations more than most people realize. Diabetics, heavy carb consumers, chronic alcohol users, and people on restricted diets that exclude fortified grains are all at elevated risk. The symptoms cluster around fatigue, neurological complaints (numbness, tingling, memory issues), cardiovascular changes (palpitations, weak contractility), and GI dysfunction — and they're easy to attribute to other causes. If your symptoms fit and you're in one of these risk categories, it's worth investigating.

If you'd like help interpreting your specific situation — whether thiamine fits, what to test, and how to address it — work with me directly. Telehealth appointments available for most US states.

Topics: Thiamine, B1, Vitamin B1, Beriberi, Fatigue, Diabetes, Alcohol, Wernicke's Encephalopathy

How To Actually Resolve Reactive Hypoglycemia

Dr. Robin Terranella — Wed, 10 Jun 2026 17:00:00 GMT

Are you having hypoglycemia or reactive hypoglycemia? Maybe this is a new thing for you and you're trying to figure it out. In this post we'll look at some approaches to resolving reactive hypoglycemia — both the obvious things and some less obvious ones that often get missed.

The Symptoms Linger Longer Than The Blood Sugar Episode

One thing worth pointing out before we get to strategies: the symptoms and problems from hypoglycemia can linger in your body far longer than the actual blood sugar episode itself. The reason is that the body's compensatory responses — the cascades that kick in to resolve the low blood sugar — keep playing out for hours after the blood sugar itself has stabilized.

Think of it like dropping a stone into a still lake. The larger the stone, the larger the waves, and they spread out from the moment the stone drops. As the wave moves outward you notice it less and less, but it's still rippling for a long time.

The Most Obvious Lever: Carbs

The first place to look is the amount of carbohydrate you're eating in a given setting. Some people need more based on their activity level, and you can get a sense of how much you need by using a continuous glucose monitor.

One thing's for sure — if you're having reactive hypoglycemia, you're eating too many carbs. But sometimes it's the type of carbohydrate more than the total quantity. There's a measure called the glycemic index, which categorizes how quickly different carb sources raise your blood sugar. Looking at this and limiting the high-glycemic-index foods will go a long way toward reducing reactive hypoglycemic events.

The Less Obvious Levers: Sleep And Digestion

Two factors that get overlooked: the depth and amount of sleep you're getting each night, and your overall digestive health.

Digestive health, in particular, can lead to alterations in the metabolism of bile acids and other products that affect glucose metabolism. One example: people with post-infectious IBS can develop decreased barrier function in the digestive tract — also known as leaky gut. People with leaky gut are more likely to have metabolic dysfunction in general — higher triglycerides, higher glucose, insulin resistance.

The mechanism involves problematic microbes (or microbial proteins) crossing the intestinal barrier and activating the immune system. There's interplay there with GLP-1, a satiety hormone, and immune cells. The immune activation from problematic microbes can disrupt the regulation of glucose-related signals.

So the digestive piece is real — and underappreciated. If your blood sugar is misbehaving and you've already cleaned up the carbs and your sleep, the gut is the next place to look.

The Practical Order Of Operations

If reactive hypoglycemia is a problem for you, the order I'd work through:

First, look at the amount of carbohydrates relative to your activity level. Cut down if needed.

Second, look at the type. Limit high-glycemic-index foods. Lower-glycemic options keep blood sugar from spiking and crashing.

Third, fix sleep — depth and quantity. Poor sleep destabilizes blood sugar regulation.

Fourth, look at the gut — especially if you've had a history of GI infections, IBS, or any reason to suspect leaky gut. Chronic inflammation from gut sources can drive metabolic dysfunction.

Conclusion

Reactive hypoglycemia isn't always solved just by eating more often. The real fix usually involves looking at carb amount and type (glycemic index), sleep, and digestive health — particularly the gut barrier. These less obvious levers are often what's actually driving the issue once the obvious carb piece is handled.

If you've been dealing with reactive hypoglycemia and the standard advice hasn't worked, work with me directly to look at all four pieces — carbs, glycemic index, sleep, and gut.

The Health Problems From High Homocysteine

Dr. Robin Terranella — Sun, 07 Jun 2026 16:59:59 GMT

Are you trying to understand what high homocysteine actually does to your body — beyond the standard answer of "you're low on B vitamins"? Elevated homocysteine is one of those lab values that's underappreciated in standard medicine, and the research is fairly clear that it's associated with a broad range of health problems independent of just being a marker for B12, folate, or B6 deficiency. In this guide, we'll look at what counts as "high," what the research says about how it damages the body, and the conditions that have been linked to it.

What Counts As High Homocysteine?

Different labs use different cutoffs, and that's part of why this test is confusing. Some labs flag anything above 10 micromoles per liter (μmol/L). Others set the threshold at 12. The clinical diagnosis of hyperhomocysteinemia — actual elevated homocysteine — generally requires a level above 15. So you can have a "high" reading on your lab without crossing the formal threshold for hyperhomocysteinemia.

Optimal levels, in my view, are around 7 to 9 μmol/L. That's where you want to land. Anything above 10 is worth paying attention to. Anything above 15 is a clinically significant elevation that warrants action.

How Homocysteine Damages The Body

Homocysteine is an amino acid that floats in the blood as part of a cyclical metabolic pathway. It gets converted into other molecules through a series of enzymatic reactions — and those enzymes need certain B vitamins (B12, folate, B6) to function. When the B vitamins are insufficient or the genetics don't support efficient conversion (such as with MTHFR mutations), homocysteine accumulates instead of getting recycled.

When homocysteine stays elevated chronically, the prevailing theory is that it damages the blood vessels. The exact mechanism isn't fully delineated in the research, but pro-inflammatory and pro-oxidative effects on vascular endothelium are thought to be central. This vascular damage is the common thread that ties together the wide range of conditions associated with high homocysteine.

Conditions Associated With High Homocysteine

The research has linked elevated homocysteine to a long list of health problems. The major ones:

Cardiovascular disease
Venous thrombosis (blood clots)
Mental health problems and cognitive impairment
Bone problems (osteoporosis, fractures)
Eye problems
Pregnancy complications
Cancer

Let's break down what each looks like.

Cardiovascular Disease And Venous Thrombosis

The link between high homocysteine and cardiovascular disease is one of the strongest associations in the research. The mechanism is thought to be that homocysteine damages the lining of blood vessels in a way that increases clotting risk and accelerates atherosclerosis. The exact cellular pathway isn't fully clear, but the clinical association is consistent: hyperhomocysteinemia is linked with deep vein thrombosis (DVT), pulmonary embolism, heart attack, and stroke.

If you've had unexplained clotting events, or if you have a family history of early cardiovascular disease, homocysteine is one of the labs that should be on the workup — alongside the standard cardiovascular markers.

Mental Health And Cognitive Impairment

Elevated homocysteine has been linked to depression, anxiety, and cognitive decline including increased risk for Alzheimer's disease. Importantly, the connection here is probably driven less by homocysteine itself and more by the underlying B vitamin deficiency that's causing the homocysteine to be high in the first place. B12, folate, and B6 are all critical for neurotransmitter synthesis and methylation processes in the brain. When those are short, mood and cognition both suffer.

The takeaway: if you're dealing with persistent depression, anxiety, or noticeable brain fog, checking homocysteine alongside the B vitamins is worth doing. It can reveal a fixable contributor.

Bone Problems

This one was new to me until I dug into the research, but high homocysteine has been linked to weakened bones and increased risk of osteoporosis. There are several studies showing this associatin. One found that women with higher homocysteine had lower bone mineral density and a higher fracture risk. The authors suggested that homocysteine may interfere with collagen cross-linking and contribute to bone resorption.

That said, there's a confounder worth flagging: people with high homocysteine often have multiple nutritional deficiencies — not just B vitamins, but also calcium, vitamin D, and other nutrients important for bone health. The studies haven't always adjusted for those factors. So the homocysteine-bone connection may be partly a marker for broader nutritional inadequacy rather than a direct mechanism. Either way, addressing it is a win for bone health.

Eye Problems

Eye complications associated with hyperhomocysteinemia are again thought to come from the vascular damage. The retina and optic nerve depend on small blood vessels, and pro-inflammatory damage to those vessels can produce a range of issues from glaucoma to retinal vein occlusion to diabetic retinopathy progression. The recurring theme — vascular damage — shows up here too.

Pregnancy Complications

High homocysteine in pregnancy is associated with a higher risk of pre-eclampsia, recurrent miscarriage, neural tube defects in the developing baby, and other complications. Two factors are at play. First, the same vascular damage that increases cardiovascular and clotting risk in adults applies to placental blood flow during pregnancy. Second, high homocysteine almost always reflects a B12 or folate deficiency — and those vitamins are essential for the rapid DNA synthesis, cell division, and nervous system development that pregnancy requires.

This is why I think homocysteine should be tested in anyone planning a pregnancy, not just folate. It catches a problem the folate test alone might miss.

Cancer

The link between high homocysteine and cancer is more recently characterized, but it's there. The proposed mechanism involves disrupted methylation — the same B-vitamin-dependent process that handles DNA repair, gene expression, and cellular regulation. When methylation is impaired, the risk of mutations and the loss of normal cellular checkpoints both increase. High homocysteine is a marker that methylation is running short.

What To Do If Your Homocysteine Is High

The good news with hyperhomocysteinemia is that it's usually responsive to treatment. The right move is some combination of:

Test the B vitamins. Serum B12, serum folate, and ideally functional markers like methylmalonic acid. Sometimes serum levels look fine but functional markers reveal a deficiency.

Check MTHFR genotype. If you have an MTHFR mutation (C677T or A1298C, especially compound heterozygous), you may need methylated forms of the B vitamins (methylfolate, methylcobalamin) rather than the standard folic acid and cyanocobalamin to actually lower homocysteine.

Address B6 status. B6 (specifically pyridoxal-5-phosphate, P5P) is the third vitamin in the homocysteine cycle and often gets overlooked.

Look at lifestyle drivers. Smoking, excessive alcohol, low dietary intake of leafy greens and B-vitamin-rich foods, and certain medications (metformin, PPIs, methotrexate among others) all push homocysteine up.

Recheck in 8 to 12 weeks. Once you've started supplementation and lifestyle changes, retest to confirm the level is dropping toward the optimal 7 to 9 range.

Conclusion

Elevated homocysteine is associated with a remarkably broad range of health problems — cardiovascular disease, blood clots, depression and cognitive decline, bone loss, eye issues, pregnancy complications, and cancer. The unifying mechanism is some combination of vascular damage and impaired methylation, both of which trace back to B vitamin status and methylation pathway efficiency.

If your homocysteine is above 10 — and certainly above 15 — it's worth taking seriously. The fix usually isn't complicated, but identifying the right form of B vitamins (especially in the presence of MTHFR variants) can be the difference between a level that drops and one that stays stuck.

Reference for the curious: PMC7345373 — Homocysteine and human health.

For a deeper guide on B12 — including how the methylated forms work and what your labs are really telling you — check out my book "Don't B12 Deficient". If you've got an elevated homocysteine and you want help building the right supplementation and lifestyle plan to bring it down — especially if you suspect MTHFR is involved — work with me directly.

Topics: Homocysteine, Hyperhomocysteinemia, Cardiovascular Disease, B12, Folate, B6, MTHFR, Methylation

Actual Reason For High Ferritin And Low Iron Saturation: Connection to Immune System

Dr. Robin Terranella — Wed, 03 Jun 2026 17:00:00 GMT

Are you looking at your blood tests and seeing you have really high ferritin and low iron saturation, and wondering why? In this post we'll break down what's actually going on in your body when you see this pattern — and why it's the immune system at the center of it.

The Two Numbers, Briefly

Iron is carried throughout the body on a carrier protein called transferrin. As iron rises, transferrin becomes more saturated — that's iron saturation. Ferritin, on the other hand, is the storage form of iron. It's a way the body holds iron for use later, and it's also a way to protect the body from iron when levels are high in circulation.

In most situations, these two numbers move together. If you're consuming a lot of iron in your diet, your iron saturation will be normal-to-high and your ferritin will be normal-to-high. They rise in parallel.

So Why Would Ferritin Be High And Saturation Low?

The main reason for the high-ferritin / low-saturation pattern is an inflammatory process going on in the body. Most often it's an infection — but it can also be autoimmune disease, bacterial infections, fungal infections, and similar conditions.

Here's the mechanism. When an infection is present, the body sequesters iron so that the iron is no longer available for the bugs to grow and proliferate. Iron in particular helps bacteria and other pathogens grow, so locking it up is a defense mechanism. The body scavenges up iron from circulation and stores it in ferritin. The result: ferritin goes up (more iron in storage) while iron saturation goes down (less iron available on transferrin).

This is driven mainly by the immune system — chemical messengers from the immune system trigger this redistribution.

Why You Don't Just Take Iron In This Situation

In situations like this you can have low hemoglobin and low red blood cells alongside the high ferritin and low saturation. The instinct might be to take an iron supplement to fix the anemia. Don't.

Two reasons. First, supplementing iron isn't really going to increase your hemoglobin and red blood cells, because the new iron will just get scavenged up into ferritin again. Second, more iron can further inflame the body — and if there's an active infection, it can actually help promote that infection and make it harder for the immune system to clear the bug.

Step one in this pattern is to check for inflammation and look for autoimmune conditions. Don't load iron until you've sorted out what's driving the sequestration.

It Can Also Be Temporary

Sometimes this pattern is just a temporary response to an active infection. During severe COVID-19 infections, for example, ferritin levels were reaching 700 to 800 and sometimes higher in patients — alongside anemia (low hemoglobin, low red blood cells) and low iron saturation. Once the infection cleared, the levels quickly normalized.

So a single high-ferritin / low-saturation reading during or just after an illness might mean nothing more than your body responding to that illness. If the pattern is lingering on multiple blood tests, that's when you want to find and clear whatever infection or autoimmune process is driving it.

Conclusion

The actual reason for the high-ferritin-with-low-iron-saturation pattern is your immune system sequestering iron away from a bug or an autoimmune driver. Treating it like iron overload is the wrong call. Treating it as iron deficiency anemia and supplementing iron is also the wrong call. The right move is to find and address the underlying inflammation source.

If you've got the high-ferritin / low-iron-saturation pattern and want help running the right workup — checking for infection, autoimmune drivers, and confirming whether the pattern is lingering — work with me directly.

Here Is What Happens With High TSH (And When To Treat)

Dr. Robin Terranella — Sun, 31 May 2026 17:00:00 GMT

If your thyroid panel comes back showing a high TSH, you're probably wondering what that actually means and what you should do next. The short answer is that an elevated TSH usually points to your thyroid not producing enough thyroid hormone — but the next step isn't always to start thyroid medication. The bigger picture matters. This guide walks through how the TSH feedback loop works, what a high TSH is really telling you, and the questions that determine whether treatment is appropriate.

How TSH And Thyroid Hormone Talk To Each Other

TSH stands for thyroid-stimulating hormone. It's released by the pituitary gland in your brain, and its job is to signal the thyroid gland in your neck to produce thyroid hormones — primarily T4 (thyroxin), which then converts to T3 (the active form) in tissues throughout the body.

The simplest way to think about this system is like a thermostat. Your brain has a "set point" for the amount of T4 it expects to see floating around in the blood. When T4 drops below that set point, the brain (specifically the pituitary) increases TSH output, which tells the thyroid: "more, please." When T4 rises back to or above the set point, the brain lowers TSH and the thyroid backs off. It's a continuous feedback loop.

So when your TSH comes back high, what your brain is saying is: "I'm not seeing enough T4 — turn up production." That's a signal from the brain, not from the thyroid itself.

What A High TSH Actually Means

If TSH is elevated, there are two main scenarios driving it:

Scenario one (most common): the thyroid isn't producing enough thyroid hormone. The pituitary is doing its job, sending a strong signal, but the thyroid gland isn't responding adequately. This is the picture of primary hypothyroidism — and it's by far the most common reason for a high TSH. Hashimoto's thyroiditis (autoimmune destruction of thyroid tissue) is the most frequent underlying cause in adults. Iodine deficiency, post-surgical changes, post-radiation effects, and certain medications can also drive it.

Scenario two (less common): the brain isn't getting the feedback signal correctly. Even though plenty of T4 may be circulating, the pituitary isn't reading it accurately. This is rarer and tends to involve more complex pituitary or hypothalamic issues.

For most people, an elevated TSH means the thyroid gland is underperforming and the brain is shouting at it to do more.

What You Might Feel With An Elevated TSH

A high TSH (and the low thyroid hormone driving it) can produce a wide range of symptoms because thyroid hormone affects nearly every tissue in the body. The classic ones:

Fatigue. Cold intolerance. Weight gain that's hard to shift. Constipation. Dry skin. Hair thinning. Brain fog and slowed thinking. Low mood. Slower heart rate. Heavier or more irregular periods.

None of these symptoms are exclusive to thyroid problems, which is why the lab test matters — and why a single elevated TSH alone isn't always the whole story.

The Question Of Whether To Treat

If your TSH is high and your thyroid hormone is clearly low, the next step is usually thyroid hormone support. That can be levothyroxine (T4), a combined T4/T3 medication, or natural desiccated thyroid — depending on the case. The goal is to give the body the thyroid hormone it isn't producing on its own.

But not every elevated TSH gets treated, and the decision depends on the overall picture. Some questions I work through with patients:

Do you actually have low thyroid hormone symptoms? The clinical picture matters. A modestly elevated TSH with no symptoms is a different situation from one with classic hypothyroid symptoms.

Do you actually have low thyroid hormone in the blood? A high TSH with normal free T4 and free T3 is called subclinical hypothyroidism. It's a real category, but the threshold for treating it is more nuanced.

Is the elevation persistent? Has it shown up on multiple thyroid tests over time, or is it from one snapshot? TSH can be transiently elevated due to acute illness, recent stress, or even certain medications. Repeating the test 6 to 8 weeks later is often the right move before starting therapy.

How high is "high" — and where in the range are your free hormones? A TSH at 5.5 with free T4 in the lower half of the range is a different story from a TSH of 12 with low-normal free T4 and clear hypothyroid symptoms.

Are antibodies present? Thyroid peroxidase (TPO) antibodies and thyroglobulin antibodies tell you whether autoimmune thyroiditis is the underlying mechanism. That changes both the treatment plan and the long-term outlook.

What "Normal" Means For TSH

The standard reference range for TSH varies by lab but typically runs from about 0.4 to 4.5 mIU/L. Functionally, I tend to look at narrower targets — most patients feel best with TSH in the 1.0 to 2.5 range, and many feel notably better when their TSH is closer to 1.

A TSH of 4.0 might be technically "in range" but is on the higher end and worth watching, especially if free T4 is lower in its range or if symptoms are present. The reference range alone can't tell you whether your thyroid is functioning optimally for you.

What Tests To Run Beyond TSH

If you have an elevated TSH, the workup I want to see is broader than just one number:

Free T4. The amount of unbound, available thyroid hormone in circulation.

Free T3. The active form. Some people convert T4 to T3 poorly, and they can have normal-looking T4 with low T3 and full hypothyroid symptoms.

Reverse T3. When the body is under chronic stress or has certain illnesses, it can shunt T4 toward reverse T3 instead of active T3 — making thyroid hormone effectively unavailable to tissues even when total levels look fine.

TPO and thyroglobulin antibodies. To rule in or out Hashimoto's.

Repeat after 6 to 8 weeks. Confirm the pattern is stable before making a treatment decision.

Conclusion

A high TSH is your brain telling your thyroid to work harder — almost always because the thyroid isn't producing enough thyroid hormone. The right response depends on the full picture: symptoms, the actual levels of free T4 and free T3, antibody status, and whether the elevation persists over time.

Don't accept a single elevated TSH as a diagnosis without the rest of the workup, and don't ignore a borderline-high TSH if you have classic symptoms. Both errors are common, and both lead to people feeling worse than they need to.

If you've got an elevated TSH and you want help interpreting the rest of the picture — symptoms, antibodies, free hormones, conversion — work with me directly to build a treatment plan that fits your situation, not just the lab number.

Topics: TSH, Thyroid, Hypothyroidism, Hashimotos, Thyroid Hormone, Free T4, Free T3, Endocrinology