Vitamin B5 and the Immune System

A common claim says your body needs vitamin B5 (pantothenic acid) to make antibodies, so you should take more of it whenever you have an infection. The first half has real roots: in small 1950s and early-1960s experiments, men deliberately made deficient in B5 were tested for their antibody response, and animal studies point the same way. The second half does not follow. No human trial shows that extra B5 prevents or shortens infections in people who already eat a normal diet. This page sorts what is shown in people, what is shown only in mice and cells, and what has never been tested.

Table of Contents

  1. The Claim: "B5 Is Needed to Make Antibodies"
  2. From Pantothenate to Immune-Cell Fuel
  3. What the Deficiency Volunteers Showed
  4. Animal and Cell Studies: Antibodies and T Cells
  5. Vanin-1, Cysteamine and Gut Inflammation
  6. Pantothenate and Tuberculosis Defence in Mice
  7. Dexpanthenol for the Nose and Mucosa
  8. What We Cannot Say
  9. Practical Steps: Food, Multivitamins and When to Get Care
  10. Safety
  11. Key Research Papers
  12. Connections
  13. Featured Videos

The Claim: "B5 Is Needed to Make Antibodies"

In a widely viewed clinician Q&A, a viewer asks whether to take B5 for an infection, and the answer is yes: B5 is needed to make antibodies, whatever kind of germ you are fighting. It is a tidy idea, and it is worth taking apart into its three pieces, because each piece has a very different amount of evidence behind it.

  1. "Immune cells need B5." True at the level of basic biochemistry. Every cell, including every white blood cell, turns pantothenate into coenzyme A (CoA), and CoA is needed to burn fuel and build fats for cell membranes. A B cell that is about to churn out antibodies is a busy, growing cell. It cannot do that without CoA.
  2. "Without enough B5, antibody production suffers." Supported, with caveats. Rats on B5-deficient diets made fewer antibodies, and a small group of human volunteers made deficient on purpose were formally tested for this (details below). The human studies were tiny and the deficiency was extreme.
  3. "So taking extra B5 helps you fight infection." Not shown. Fixing a shortage is not the same as topping up a tank that is already full. There is no trial in well-nourished people showing that extra B5 prevents colds, flu or any other infection, or makes them shorter.

Think of it like petrol in a fire engine. With an empty tank the engine cannot reach the fire — that part is real. But pouring extra petrol into a full tank does not make the engine go faster. Most of this page is about telling the empty-tank evidence apart from the full-tank promise.

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From Pantothenate to Immune-Cell Fuel

Pantothenate, the form of B5 in food, is carried into cells and built up in five enzyme steps into coenzyme A (the full chemistry is on our Coenzyme A Synthesis page). CoA works like a forklift: it picks up two-carbon pieces from sugar and fat and drops them into the cell's energy furnace, and it hands fatty-acid building blocks to the machinery that makes new membranes. A lymphocyte that is waking up to fight an infection has to do both at once — burn more fuel and build a lot of new membrane as it divides and swells.

That is why immunologists have become interested in CoA. Different immune cells run on different fuel mixes. In mouse experiments, inflammatory "effector" T cells lean on sugar burning (glycolysis), while regulatory T cells — the peacekeepers that stop the immune system attacking the body — lean on burning fat (Michalek 2011). Fat can only be burned after it is attached to CoA, so CoA sits on the route that regulatory T cells depend on. In another mouse study, a subset of killer (CD8) T cells with strong anti-tumour activity switched on the pantothenate–CoA pathway, and giving CoA pushed T cells towards that subset (St Paul 2021). A 2023 review of this field asks, with a question mark, whether the B5/CoA axis could be a target for adjusting immunity (Miallot 2023). That question mark is honest: these are mechanisms seen in mice and dishes.

The diagram below draws the chain. Solid lines are the links with some human data behind them; dashed lines and dashed boxes are links seen only in animals or cells. Notice what is missing: there is no arrow from "extra B5" to "fewer infections".

A pathway diagram: pantothenate from food becomes coenzyme A, which fuels immune-cell energy and membrane building, which supports antibody production and T-cell programmes. A red branch shows that induced B5 deficiency in human volunteers weakened antibody responses, while dashed boxes mark links seen only in mice or cells: T-cell programmes, tuberculosis defence and gut inflammation through vanin-1. No arrow runs from extra B5 to fewer infections. FROM VITAMIN B5 TO IMMUNE DEFENCE solid = some human data · dashed = animal or cell data only · red = what deficiency did PANTOTHENATE vitamin B5 from everyday food COENZYME A (CoA) built in five enzyme steps ENERGY + MEMBRANE FATS fuel and building blocks for dividing cells ANTIBODY PRODUCTION B cells need fuel and membrane T-CELL PROGRAMMES fat-burning peacekeepers, CD8 subsets — mice INDUCED DEFICIENCY volunteers, 1950s, B5 blocker human data: antibody response tested in a handful of deficient men (1962 reports) TB DEFENCE (MICE) oral B5: fewer lung bacteria GUT INFLAMMATION mice: vanin-1 frees cysteamine WHAT THE CHAIN SHOWS an empty tank stalls the engine severe deficiency can weaken antibodies no arrow from extra B5 to fewer infections never tested in well-fed people a full tank does not drive faster

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What the Deficiency Volunteers Showed

Evidence tier: small human experiments (a handful of men per study, no placebo group in the modern sense). B5 is in almost every food, so ordinary deficiency is extremely rare and nobody could study it by waiting for patients to appear. In the 1950s a team at the State University of Iowa created it on purpose in volunteers from a prison population, feeding them a purified diet low in B5 and, in later rounds, adding omega-methyl pantothenic acid — a look-alike molecule that blocks B5. The full story is on our Human Deficiency Experiments page; here we keep to what bears on immunity.

The 1958 summary paper (Hodges, Ohlson and Bean) describes fatigue, apathy, stomach upset, personality change, burning sensations in the hands and feet, and a tendency to orthostatic hypotension — blood pressure dropping on standing. (The same Q&A describes this as orthostatic "hypertension"; the papers say the opposite, a fall.) On infection the authors were candid that the results were inconsistent: in some rounds infections were common and in others they were not. One man who had many infections showed a drop in gamma globulins — the blood protein fraction that contains antibodies — while the others stayed normal, and in one experiment the rate of infections was "not unusual" and about the same across the test groups.

The 1959 paper followed four healthy men aged 22 to 29 given the blocker in different doses; they became ill within about four weeks instead of the twelve that diet alone had taken, and recovered when they were given 4 grams of pantothenic acid a day.

The antibody reports. The team then published a series titled Factors affecting human antibody response. Part III (1962) covers the immunologic responses of men deficient in pantothenic acid, and Part V (1962) covers men deficient in both pantothenic acid and vitamin B6 at once. This is where the "B5 makes antibodies" idea comes from. A caution about our own reporting: these two papers have no abstract in PubMed and we could not read their full text, so we have not repeated specific figures from them. Secondary accounts say the deficient men mounted a weaker antibody response after test immunisations, with tetanus antigen often named; that fits the animal data below, but we could not confirm the details from the original.

What this evidence can and cannot carry:

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Animal and Cell Studies: Antibodies and T Cells

Evidence tier: animal and laboratory studies (preliminary for humans). Most of the "B5 and antibodies" literature was done in rats from the 1940s to the 1970s, largely in one laboratory. Its titles tell the story plainly: in 1960 Axelrod and Hopper studied the effect of pantothenic acid, pyridoxine (B6) and thiamine (B1) deficiencies on antibody formation against an influenza virus in rats. Deficient animals made fewer antibodies, and the effect was not unique to B5 — B6 deficiency was at least as damaging. That matters for the claim, because it shows the antibody system suffers whenever a growing cell is short of a key cofactor; it is not a special B5 switch.

The modern work looks inside T cells:

Put simply: the cell biology is real and interesting, it is mostly mouse work, and the doses and settings (cancer immunotherapy, lab-grown cells) are a long way from taking a B5 capsule for a cold.

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Vanin-1, Cysteamine and Gut Inflammation

Evidence tier: mouse studies. Your gut lining and liver carry an enzyme called vanin-1, a pantetheinase. Its job is recycling: it splits pantetheine (a piece of broken-down CoA) back into pantothenic acid, which can be reused, and a small sulphur molecule called cysteamine. This is a corner of B5 biology where the story is not "more is better".

What this does and does not mean: in mice, the by-product of B5 recycling helps turn up gut inflammation, and researchers are now designing drugs to block vanin-1 for inflammatory bowel disease. It does not mean B5 from food inflames the gut, and it is not a reason to avoid B5. It is a useful reminder that the B5–CoA system has dials that turn inflammation both up and down, which is exactly why "B5 boosts immunity" is too simple a slogan. If you live with Crohn's disease or ulcerative colitis, none of this is yet a treatment.

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Pantothenate and Tuberculosis Defence in Mice

Evidence tier: mouse and cell-culture study; no human trial. He and colleagues (2018) asked whether B5 could help the immune system fight Mycobacterium tuberculosis, the germ that causes TB. They used a standard laboratory strain (H37Rv).

This is a genuine, well-designed animal result and a reasonable lead for further research. It is not evidence that B5 treats or prevents TB in people. TB is cured with a full course of antibiotics, usually for months, and stopping or replacing them with supplements risks relapse and drug resistance. If you have a cough lasting three weeks or more, night sweats, weight loss or blood in your sputum, see a clinician; our Tuberculosis page explains testing and treatment.

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Dexpanthenol for the Nose and Mucosa

Evidence tier: small randomised trials; this is surface care, not immune boosting. Dexpanthenol is the alcohol form of B5. Applied to skin or the lining of the nose, it is absorbed and converted to pantothenic acid, where it seems to help surface cells repair. Our wound-healing page covers the skin side. For the nose, the evidence looks like this:

Notice what these trials measure: crusts, airflow, mucus clearance. They support dexpanthenol as a soothing, healing nasal moisturiser. They say nothing about preventing infections or strengthening antibodies, and swallowing B5 tablets is not the same as spraying dexpanthenol onto a dry nose.

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What We Cannot Say

Here it is plainly: no human trial shows that extra vitamin B5 prevents infections or makes them shorter in people who are already well nourished. We looked. There are no randomised trials of oral pantothenic acid for colds, flu, pneumonia, urinary infections or any other infection in healthy people. The claim rests on the step from "deficiency harms antibodies" to "supplements help antibodies", and that step has never been tested.

The closest real-world test is broader. In the MAVIS trial (Avenell 2005), 910 adults aged 65 or over living at home took a daily multivitamin-multimineral — which included B vitamins — or a placebo for one year. Supplements made no difference to infection-related visits to the doctor, self-reported days of infection or quality of life. That was not a B5 study, but it is a fair warning that even a whole basket of vitamins does not reduce infections in people who are not deficient.

The evidence ladder below puts the three claims side by side.

An evidence ladder with three rungs: induced B5 deficiency in human volunteers weakening antibody responses rates moderate evidence; animal and cell studies linking B5 and coenzyme A to T cells, tuberculosis defence and gut inflammation rate preliminary; the claim that extra B5 boosts immunity in healthy people has no trial evidence at all, and a 910-person multivitamin trial found no fewer infections. EVIDENCE LADDER how far each B5 immune claim is supported · longer bar = stronger evidence REMOVING B5 FROM PEOPLE induced deficiency in volunteers — antibody response tested moderate tiny groups, extreme deficiency, 1950s to 1962 B5 AND CoA IN MICE AND CELLS rat antibodies, T-cell fuel, TB in mice, vanin-1 and the gut preliminary real mechanisms, not yet shown in people "EXTRA B5 BOOSTS IMMUNITY" fewer or shorter infections in well-fed people no trial the step from shortage to supplement was never tested WHY THE GAP fixing a shortage helps an empty tank stalls the engine topping up a full tank does not make it go faster real deficiency is rare B5 is in almost every food a multivitamin trial in 910 older adults for one year: no fewer infection days

None of this makes B5 unimportant. It is essential, and a real deficiency would hurt immunity along with almost everything else. The point is narrower: for someone eating ordinary food, the immune benefit of extra B5 is unproven, and a supplement bought on that promise is a bet, not a treatment.

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Practical Steps: Food, Multivitamins and When to Get Care

Get B5 from whole food

The adult Adequate Intake is 5 mg per day, and a normal mixed diet usually reaches it without trying (see our B5 Food Sources page for amounts). Good whole-food sources include:

B5 is fairly sturdy but some is lost in heavy processing, canning and freezing, so a diet built on home-cooked whole foods covers it far better than one built on packaged meals.

When a multivitamin is reasonable

A basic B-complex or multivitamin is a sensible safety net in a few situations: a very restricted or very low intake diet, heavy alcohol use, long-term kidney dialysis, recovery from major illness or surgery with poor appetite, or certain bowel conditions that limit absorption (our Risk Factors and Depleters page lists them). In these cases, several B vitamins tend to run low together — remember that the antibody experiments and rat studies found B6 at least as important as B5 — so a combined product makes more sense than high-dose B5 alone. For forms and doses, see B5 Dosing and Supplement Forms.

When an infection needs medical care

No vitamin replaces assessment when an infection is serious. Get prompt care for:

For everyday colds, rest, fluids and time remain the backbone; our Common Cold page covers what has been tested.

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Safety

Pantothenic acid is one of the safest vitamins. No Tolerable Upper Intake Level has been set, because no clear harm has been found at normal supplement doses. Very large amounts — around 10 grams per day of calcium pantothenate — can cause diarrhoea and stomach upset; see our B5 Toxicity page for the rare reports beyond that.

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Key Research Papers

  1. Hodges RE, Ohlson MA, Bean WB (1958). Pantothenic acid deficiency in man. Journal of Clinical Investigation. — PubMed PMID: 13587673
  2. Hodges RE, Bean WB, Ohlson MA, Bleiler R (1959). Human pantothenic acid deficiency produced by omega-methyl pantothenic acid. Journal of Clinical Investigation. — PubMed PMID: 13673099
  3. Hodges RE, Bean WB, Ohlson MA, Bleiler RE (1962). Factors affecting human antibody response. III. Immunologic responses of men deficient in pantothenic acid. American Journal of Clinical Nutrition. — PubMed PMID: 13907958
  4. Hodges RE, Bean WB, Ohlson MA, Bleiler RE (1962). Factors affecting human antibody response. V. Combined deficiencies of pantothenic acid and pyridoxine. American Journal of Clinical Nutrition. — PubMed PMID: 13907960
  5. Axelrod AE, Hopper S (1960). Effects of pantothenic acid, pyridoxine and thiamine deficiencies upon antibody formation to influenza virus PR-8 in rats. Journal of Nutrition. — PubMed PMID: 13685332
  6. Michalek RD, Gerriets VA, Jacobs SR, Macintyre AN, MacIver NJ, Mason EF, et al. (2011). Cutting edge: distinct glycolytic and lipid oxidative metabolic programs are essential for effector and regulatory CD4+ T cell subsets. Journal of Immunology. — PubMed PMID: 21317389
  7. St Paul M, Saibil SD, Han S, Israni-Winger K, Lien SC, Laister RC, et al. (2021). Coenzyme A fuels T cell anti-tumor immunity. Cell Metabolism. — PubMed PMID: 34879240
  8. Miallot R, Millet V, Galland F, Naquet P (2023). The vitamin B5/coenzyme A axis: a target for immunomodulation? European Journal of Immunology. — PubMed PMID: 37482959
  9. Martin F, Penet MF, Malergue F, Lepidi H, Dessein A, Galland F, et al. (2004). Vanin-1(-/-) mice show decreased NSAID- and Schistosoma-induced intestinal inflammation associated with higher glutathione stores. Journal of Clinical Investigation. — PubMed PMID: 14966568
  10. Berruyer C, Pouyet L, Millet V, Martin FM, LeGoffic A, Canonici A, et al. (2006). Vanin-1 licenses inflammatory mediator production by gut epithelial cells and controls colitis by antagonizing peroxisome proliferator-activated receptor gamma activity. Journal of Experimental Medicine. — PubMed PMID: 17145956
  11. He W, Hu S, Du X, Wen Q, Zhong XP, Zhou X, et al. (2018). Vitamin B5 reduces bacterial growth via regulating innate immunity and adaptive immunity in mice infected with Mycobacterium tuberculosis. Frontiers in Immunology. — PubMed PMID: 29535733
  12. Kehrl W, Sonnemann U (1998). Dexpanthenol nasal spray as an effective therapeutic principle for treatment of rhinitis sicca anterior. Laryngo-Rhino-Otologie. — PubMed PMID: 9795928 (article in German)
  13. Tantilipikorn P, Tunsuriyawong P, Jareoncharsri P, Bedavanija A, Assanasen P, Bunnag C, et al. (2012). A randomized, prospective, double-blind study of the efficacy of dexpanthenol nasal spray on the postoperative treatment of patients with chronic rhinosinusitis after endoscopic sinus surgery. Journal of the Medical Association of Thailand. — PubMed PMID: 22379743
  14. Avenell A, Campbell MK, Cook JA, Hannaford PC, Kilonzo MM, McNeill G, et al. (2005). Effect of multivitamin and multimineral supplements on morbidity from infections in older people (MAVIS trial): pragmatic, randomised, double blind, placebo controlled trial. BMJ. — PubMed PMID: 16081445

PubMed Topic Searches

  1. PubMed: Pantothenic acid and antibody response
  2. PubMed: Coenzyme A and T-cell metabolism
  3. PubMed: Vanin-1 (pantetheinase) and inflammation

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Connections

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