The 1950s Human Vitamin B5 Deficiency Experiments

Almost everything we know about what a lack of vitamin B5 (pantothenic acid) does to a person comes from a handful of young men in Iowa in the 1950s. B5 is in nearly every food, so nobody runs out of it by accident — researchers had to feed volunteers a lab-made, B5-free formula by stomach tube, often with a drug that blocks the vitamin, before anything went wrong. What followed was fatigue, irritability, numb and burning hands and feet, stomach upset, and blood pressure that dropped when the men stood up — and most of it eased once the vitamin was given back. This page walks through what those studies really found, what they got wrong and corrected themselves, and what they do and do not mean for your own plate.

Table of Contents

  1. Why Researchers Had to Induce It
  2. The Iowa Program, 1954–1962
  3. What the Volunteers Experienced
  4. How Fast It Came On, and How It Reversed
  5. The 1976 Diet-Only Study
  6. What the Team Corrected About Its Own Work
  7. The Ethics of Prison Research in That Era
  8. What It Means for Everyday Eating
  9. Key Research Papers
  10. Connections
  11. Featured Videos

Why Researchers Had to Induce It

Most vitamin deficiencies were discovered the hard way: a population ate a narrow diet, people fell ill, and doctors worked backwards. Scurvy, beriberi and pellagra all arrived that way. Vitamin B5 never did. Its very name comes from the Greek pantothen, "from everywhere," and that is the problem in a nutshell — it is spread through meat, eggs, whole grains, legumes, vegetables and mushrooms so evenly that a diet poor enough to lack it is almost always lacking several other vitamins first.

The Iowa researchers said exactly this when they started. In the opening of their 1958 report they wrote, in effect, that B5 was assumed to be necessary for human health but was so abundant in natural foods that spontaneous deficiency either did not happen or had never been recognised; even in very poor diets, some other vitamin would run out first. A 2023 scoping review for the Nordic Nutrition Recommendations reaches the same conclusion seventy years later: nutritional deficiency of pantothenic acid is rare, and when it occurs it is usually tangled up with multiple nutrient deficiencies (narrative review).

There is also a biological reason the body is hard to drain. B5's job is to become coenzyme A (CoA), the molecular "tow hook" that carries two-carbon fragments into the energy cycle and fat metabolism. A 1991 review in Vitamins and Hormones noted that, surprisingly, tissue CoA levels do not fall much in pantothenate deficiency — which suggests cells recycle the B5 locked inside their own CoA rather than throwing it away. Think of it as a household that reuses its tools instead of buying new ones: cut off the shop, and the toolbox still lasts a while.

So the researchers had two choices, which they spelled out: build a diet with no B5 in it at all, or give a drug that imitates the vitamin and jams its machinery. They ended up doing both.

(For the everyday picture of who might run low, see the main B5 deficiency page and risk factors and depleters.)

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The Iowa Program, 1954–1962

The work came from the Metabolism Section of the Department of Medicine at the State University of Iowa (now the University of Iowa), led by internist William B. Bean and Robert E. Hodges, with dietitian Margaret A. Ohlson and others. By 1958 they described themselves as having studied B5 in people for seven years. Their volunteers were young men from the Iowa State Reformatory at Anamosa, enrolled with the cooperation of the warden and the State Board of Control — a common arrangement at the time (see the ethics section).

The program unfolded as a series of small studies, each correcting the last:

  1. 1954 — first report. Bean and Hodges announced in Proceedings of the Society for Experimental Biology and Medicine that B5 deficiency could be induced in human subjects. The team later described this as the moment they showed the vitamin is essential in human nutrition.
  2. 1955 — the detailed account. In the Journal of Clinical Investigation (JCI), Bean, Hodges and Daum described volunteers fed a purified, B5-free formula by stomach tube. An earlier attempt with a weak blocker, pantoyltaurine, did nothing — the diet alone for four weeks, or with pantoyltaurine for eight weeks, produced no symptoms and little metabolic change. Only when a stronger blocker, omega-methylpantothenic acid, became available did the men become ill. A companion paper by Thornton, Bean and Hodges reported effects on stomach acid and gut movement.
  3. 1958 — the controlled repeat. Hodges, Ohlson and Bean ran a better-designed study with six men aged 19 to 35, paired by weight: two got the B5-free formula alone (the "deficient pair"), two got the formula plus the blocker (the "antagonist pair"), and two got the same formula with 20 mg of B5 a day added (the controls). None of the men knew which group he was in, and placebo pills and injections were given so every man received the same procedures.
  4. 1959 — the blocker on ordinary food. Hodges, Bean, Ohlson and Bleiler gave four men aged 22 to 29 a normal, balanced 3,200-calorie hospital diet (calculated at about 8.5 mg of B5 a day) and added different doses of the blocker to three of them, to see whether the drug alone could reproduce the illness.
  5. 1962–1964 — immunity. The same group published a series titled "Factors affecting human antibody response," including one on "immunologic responses of men deficient in pantothenic acid" and another on combined B5 and B6 deficiency.

Evidence tier: every one of these is a small experimental study — between three and six men at a time, with no statistics in the modern sense. They are best thought of as carefully observed experimental case series. That is a real limitation, and the authors said so themselves.

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What the Volunteers Experienced

The 1958 paper gives the clearest picture, because it had controls. During a three-week warm-up on an ordinary hospital diet blended and given by tube, all six men stayed well apart from trivial complaints. Then, on the B5-free formula, the antagonist pair changed first: they became irritable, restless and quarrelsome, swung between sleepiness and insomnia, tired out on their daily walk, and broke into heavy sweats at little or no provocation. "A little later" the deficient pair began to report the same things, and from then on the two groups could not be told apart. The controls stayed well.

The authors' own summary of the syndrome is worth paraphrasing closely, because it is the source most later articles quote:

About immunity specifically: the team followed up in 1962 with formal antibody studies after vaccine-type antigens. Later summaries commonly report that the B5-deficient men made a weaker antibody response, notably to tetanus antigen; we could not obtain the full text of that 1962 paper to confirm the details, so treat that specific point as a reported summary rather than something we have checked line by line.

A grid of six panels: five group the symptoms the Iowa volunteers developed on a vitamin B5-free regimen (nervous system and mood, gut, heart and circulation, immune, metabolic and hormonal), and a sixth, marked in red, lists the early findings the researchers later traced to flaws in their own formula rather than to B5. WHAT B5 DEPRIVATION DID — AND WHAT IT DID NOT Iowa volunteers, 1955–1959 · small experimental studies of three to six men each NERVOUS SYSTEM & MOOD fatigue, headache, weakness irritability, quarrelsome mood sleepiness swinging with insomnia numbness, tingling, burning of the hands and feet clumsy, staggering gait; cramps tingling began days 12–16 (1955) GUT nausea, occasional vomiting burning in the upper stomach cramps, loud rumbling, more gas occasional diarrhoea stomach-acid drop: transient by 1958 HEART & CIRCULATION fast heart rate blood pressure swinging pressure FALLING on standing = postural hypotension dizzy spells, no fainting less regular than the nerve signs IMMUNE repeated sore throats and colds slightly lower gamma-globulin infections cleared on a good diet antibody studies followed in 1962 METABOLIC & HORMONAL more sensitive to insulin no eosinophil drop after ACTH (the most consistent lab change) adrenal output itself looked normal LATER RULED ARTIFACTS low cholesterol → corn oil odd glucose curves → fast absorption of liquid formula low potassium → salt mix low 17-ketosteroids → big test doses of PABA not caused by missing B5

Read the panel in the lower right as carefully as the other five. Some of the most dramatic findings in the early papers turned out to be side effects of the experiment itself, and the researchers said so in print — see what the team corrected.

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How Fast It Came On, and How It Reversed

In their 1959 paper the team summed up the earlier work in two numbers. Young men fed the purified, B5-free diet alone became ill after about 12 weeks. Adding the blocker, omega-methylpantothenic acid, brought the illness on in about four weeks. The blocker is a near-copy of the vitamin that the body takes up but cannot use, so it competes with whatever B5 is left — like jamming a slightly wrong key into a lock so the right key cannot get in.

The 1958 study shows the slow side in the urine. In the deficient pair, the amount of B5 excreted fell steadily and approached zero after the 11th week on the formula. That is the body clamping down on losses — and it is also why urinary B5 is still the standard marker of status today (more on that in testing for B5).

The blocker's effect was not even steady. In 1958 the antagonist pair started on 750 mg a day; when some of their symptoms began to fade on their own, the dose was raised to 1,000 mg a day and the abnormalities came back. The authors suspected that a function as vital as CoA may be protected by back-up pathways while a deficiency is setting in — but admitted they had no data to explain it.

A timeline in weeks: on a B5-free diet with the blocking drug, the Iowa volunteers became ill at about week four; on the B5-free diet alone, urinary B5 approached zero after week eleven and illness appeared at about week twelve; in both, large doses of the vitamin then relieved most symptoms, though fatigue and some irritability lingered. HOW FAST THE VOLUNTEERS FELL ILL weeks on a B5-free formula · as the Iowa team summarised its own work in 1959 start 4 8 12 16 weeks on the deficient regimen → (approximate) B5-free diet + blocking drug ill at about 4 weeks B5 given back B5-free diet alone urine B5 near zero after week 11 ill at about 12 weeks WHAT THE TIMING SAYS the blocker is the shortcut a look-alike molecule crowds out what B5 the body still holds diet alone is slow months on a lab formula given by tube before anything showed repair was real but partial 4,000 mg a day eased numbness and weakness; fatigue and some irritability lingered it took a purified diet and a drug to break it — no ordinary menu does this.

Reversal. At the end of the deficient period in 1958, every deficient man was given 4,000 mg of B5 a day — roughly 800 times the modern Adequate Intake of 5 mg, an amount chosen to flood the system, not a dose anyone should copy. The response was prompt: the lost eosinophil response to ACTH came back, most clinical symptoms subsided, and the antagonist pair swung into strongly positive nitrogen balance (their bodies began holding on to protein again). The men excreted only a small fraction of that huge dose in the urine, a sign of how depleted they had become. Adding injections of coenzyme A itself in the final week gave no extra benefit over plain B5.

Recovery was not complete in every respect. The authors wrote that B5 improved the paresthesias and muscle weakness, but fatigue and some irritability persisted; and in the 1955 study the tingling cleared fully while the motor weakness recovered only slowly. They stated plainly that "prompt and complete recovery did not always follow" the vitamin.

The 1959 blocker-on-normal-food study sharpens the picture. With ordinary meals providing about 8.5 mg of B5 a day, the four men got either no blocker, or 0.5, 1 or 2 g a day from the third week, doubled at the start of the seventh week and stopped in the twelfth, after which each man received 4 g of B5 daily. The control man and the man on the smallest dose stayed essentially well. The man on the middle dose became sleepy, irritable and depressed, developed a hand tremor, nausea and occasional vomiting, and lost his eosinophil response to ACTH in the tenth week — all of which settled soon after B5 was given. The man on the highest dose reported almost nothing except a hand tremor, yet his laboratory tests showed the lost ACTH response and increased insulin sensitivity, both of which returned toward normal with B5. Even with a drug forcing the issue, people responded very differently.

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The 1976 Diet-Only Study

A frequently cited follow-up is sometimes described as an "earlier" diet-only study, but it actually came two decades after the Iowa work. In 1976, Fry, Fox and Tao (University of Nebraska) published in the Journal of Nutritional Science and Vitaminology a study in which adult men ate a low-B5 test diet, or the same diet with 10 mg of B5 added daily, for 63 days — no stomach tube and no blocking drug.

What they measured was biochemistry, not illness. Average urinary B5 in the deprived men fell from 3.05 to 0.79 mg a day over the 63 days, while in the four supplemented men it rose from 3.95 to 5.84 mg. When both groups were then given a 100 mg test dose for a week, the previously deprived men retained 63% of it on the first day versus 48% in the supplemented men — their bodies were soaking it up. Blood B5 fell in the deprived group but responded less readily than urine. Nitrogen retention tended to be higher in the supplemented men.

The abstract reports no clinical deficiency syndrome, which fits the Iowa experience: about nine weeks on a low-B5 diet moves the laboratory markers well before it produces anything a person would feel. It is also the study behind a practical rule of thumb — urinary B5 below about 1 mg a day is widely treated as low (the 2023 Nordic review uses that cut-off).

Evidence tier: small controlled feeding study; biochemical outcomes only.

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What the Team Corrected About Its Own Work

One of the most admirable things about the Iowa papers is a section of the 1958 report headed, in effect, "a review of our errors in interpretation." Having designed the 1958 study with multiple control groups precisely to test their earlier findings, the authors concluded that some earlier "signs of B5 deficiency" were really caused by the experiment:

Several other findings they left as uncertain: faulty acetylation, irregular heart rhythms and electrocardiogram changes, and erratic water handling. Their conclusion was balanced: some earlier observations were confirmed, some reinterpreted and a few were artifacts, "yet the characteristics of pantothenic acid deficiency remain sufficiently clear and consistent to constitute an entity."

That matters for readers today, because lists of "B5 deficiency symptoms" online often still include low cholesterol, low stomach acid or low adrenal output — items the original investigators themselves walked back.

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The Ethics of Prison Research in That Era

The volunteers were inmates of the Iowa State Reformatory at Anamosa. The 1955 paper says the study was done "with prisoners as volunteers," authorised by the State Board of Control; the 1958 and 1959 papers thank the volunteers and the warden by name. The 1958 regimen was demanding: liquid formula by stomach tube twice a day for up to 15 weeks, weekly hormone injections, insulin tests and stomach-acid sampling, and daily collection of all urine and stool.

This was not unusual for its time. Through the middle of the twentieth century, American prisons were a common source of research volunteers for drug, vaccine and nutrition studies; one historian summed up the reason in a 1997 BMJ article titled "They were cheap and available." The central ethical problem, recognised later, is whether consent given inside a prison can be truly free when the setting itself limits choices and any reward — money, better food, a change of routine, hoped-for favour at a parole hearing — carries outsized weight.

The Iowa authors did show awareness of the risks. In the 1959 paper they wrote that a physician-investigator's ethical and moral obligations to the subjects' welfare made them proceed slowly, accept early and partial illness as evidence of deficiency, and restore adequate nutrition promptly once illness was established, because trying to produce severe, prolonged symptoms in everyone "might result in injurious or even fatal disease."

In the 1970s a U.S. national commission reviewed research involving prisoners, and since 1978 federal human-research rules have included a separate set of extra protections for prisoners (Subpart C of the federal Common Rule, 45 CFR 46). Studies like the Iowa series — deliberately making healthy people ill with no possible benefit to them — would face a very different review today. That history is part of why these experiments have never been repeated, and why the 1950s data, for all their limits, remain the main human evidence we have.

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What It Means for Everyday Eating

What the experiments do tell us. B5 is essential for people — take it away completely and a recognisable illness follows, centred on fatigue, mood change, nerve symptoms in the hands and feet, gut upset and an unsteady circulation, and most of it reverses with the vitamin. They also explain why the "burning feet" seen in starving prisoners of war in the 1940s (described in India by Gopalan in 1946) was suspected to involve B5: the Iowa team explicitly suggested that the burning-feet element of naturally occurring deficiency might be mediated by a lack of B5.

What they do not tell us.

Three common claims, checked against the papers.

Safety and practical take. For almost everyone, the answer is food, not pills: eggs, liver and other meats, fish, mushrooms, avocado, sunflower seeds, lentils and other legumes, whole milk and yoghurt, sweet potatoes, broccoli and whole grains such as brown rice all contribute. Supplements are generally safe — no upper limit has been set — but very large intakes of 10–20 g a day have been linked to diarrhoea and water retention, and the 4,000 mg a day used to rescue the volunteers was a research dose for a deliberately induced deficiency, not a template. If you have persistent burning feet, numbness, unexplained fatigue or dizziness on standing, the useful step is a proper medical work-up for the common causes rather than assuming B5. Dosing details are on B5 dosing and supplement forms.

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Key Research Papers

  1. Bean WB, Hodges RE (1954). Pantothenic acid deficiency induced in human subjects. Proc Soc Exp Biol Med 86(4):693–698. — PubMed PMID: 13204326
  2. Bean WB, Hodges RE, Daum K (1955). Pantothenic acid deficiency induced in human subjects. J Clin Invest 34(7, Part 1):1073–1084. — PubMed PMID: 14392222
  3. Thornton GH, Bean WB, Hodges RE (1955). The effect of pantothenic acid deficiency of gastric secretion and motility. J Clin Invest 34(7, Part 1):1085–1091. — PubMed PMID: 14392223
  4. Hodges RE, Ohlson MA, Bean WB (1958). Pantothenic acid deficiency in man. J Clin Invest 37(11):1642–1657. — PubMed PMID: 13587673
  5. Hodges RE, Bean WB, Ohlson MA, Bleiler R (1959). Human pantothenic acid deficiency produced by omega-methyl pantothenic acid. J Clin Invest 38(8):1421–1425. — PubMed PMID: 13673099
  6. Hodges RE, Bean WB, Ohlson MA, Bleiler RE (1962). Factors affecting human antibody response. III. Immunologic responses of men deficient in pantothenic acid. Am J Clin Nutr 11:85–93. — PubMed PMID: 13907958
  7. Hodges RE, Bean WB, Ohlson MA, Bleiler RE (1962). Factors affecting human antibody response. V. Combined deficiencies of pantothenic acid and pyridoxine. Am J Clin Nutr 11:187–199. — PubMed PMID: 13907960
  8. Fry PC, Fox HM, Tao HG (1976). Metabolic response to a pantothenic acid deficient diet in humans. J Nutr Sci Vitaminol (Tokyo) 22(4):339–346. — PubMed PMID: 1011047
  9. Gopalan C (1946). The burning-feet syndrome. Ind Med Gaz 81(1):22–26. — PubMed PMID: 21025573
  10. Tahiliani AG, Beinlich CJ (1991). Pantothenic acid in health and disease. Vitam Horm 46:165–228. — PubMed PMID: 1746161
  11. Leonardi R, Jackowski S (2007). Biosynthesis of pantothenic acid and coenzyme A. EcoSal Plus 2(2). — PubMed PMID: 26443589
  12. Hornblum AM (1997). They were cheap and available: prisoners as research subjects in twentieth century America. BMJ 315(7120):1437–1441. — PubMed PMID: 9418095
  13. Freese R, Aarsland TE, Bjørkevoll M (2023). Pantothenic acid — a scoping review for Nordic Nutrition Recommendations 2023. Food Nutr Res 67. — PubMed PMID: 38187802

PubMed Topic Searches

  1. PubMed: Experimental pantothenic acid deficiency in humans
  2. PubMed: Omega-methylpantothenic acid (the B5 antagonist)
  3. PubMed: Urinary pantothenic acid as a status marker

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Connections

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