Vitamin B3: History and Discovery

Vitamin B3 has one of the strangest discovery stories of any vitamin: the cure was sitting on a laboratory shelf for twenty-five years before anyone realised what it was. Around 1911–1912, the chemist Casimir Funk — the same man who coined the word vitamine, which appeared in his 1912 paper — isolated a compound reported to be nicotinic acid while searching for the cure to a different deficiency disease, beriberi. It did not cure beriberi, so he put it aside. Not until 1937 did the American biochemist Conrad Elvehjem and his team at the University of Wisconsin prove that this same overlooked molecule was the long-sought cure for pellagra — the "Four-D" disease (dermatitis, diarrhoea, dementia, death) that had killed hundreds of thousands of people, especially across the American South. This article tells that story honestly: who first made the molecule, who proved pellagra was a deficiency disease, who finally connected the two, why the vitamin was renamed "niacin," and how it later turned out to be the building block of NAD, one of the most important molecules in every living cell. Where a claim is firmly documented we say so; where priority is shared or a detail is uncertain, we say that too.

Table of Contents

  1. Two Molecules, One Confusing Name
  2. A Chemical Curiosity: Hugo Weidel, 1873
  3. Casimir Funk, "Vitamine," and the Molecule He Set Aside (1912)
  4. Pellagra: The Deficiency Disease That Drove the Search
  5. Joseph Goldberger Proves It Is the Diet, Not a Germ
  6. The Breakthrough: Conrad Elvehjem and Black Tongue (1937)
  7. From "Nicotinic Acid" to "Niacin" (1942)
  8. The Deeper Discovery: Niacin Becomes NAD
  9. The Tryptophan Twist (1945)
  10. Legacy: From Famine Disease to Longevity Science
  11. Research Papers and References
  12. Connections
  13. Featured Videos

Two Molecules, One Confusing Name

Before the story begins, one point clears up most of the confusion that surrounds Vitamin B3's history. The vitamin exists in two closely related everyday forms: nicotinic acid and nicotinamide (also spelled niacinamide). Both were discovered through the work described below, and both are converted in the body to the same active molecules. Today the vitamin is usually called niacin — a name deliberately invented in the 1940s to stop people confusing it with nicotine, the tobacco poison. The two share part of a name only because of how the molecule was first made in the laboratory, not because they do anything alike in the body.

That accident of naming is itself a piece of the history. Nicotinic acid got its name because chemists first produced it by chemically breaking down nicotine — a purely laboratory relationship. When the substance later turned out to be an essential, life-saving vitamin that food companies wanted to add to bread, the unfortunate echo of "nicotine" became a public-relations problem, and the vitamin was renamed. We will come to that renaming in its proper place; it helps to know from the start that "nicotinic acid," "nicotinamide," "niacin," and "Vitamin B3" all refer to the same vitamin.

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A Chemical Curiosity: Hugo Weidel, 1873

The molecule we now call niacin was known to chemists long before anyone suspected it had anything to do with health. The compound was first produced in 1867 by the oxidative breakdown of nicotine, and in 1873 the Austrian chemist Hugo Weidel (1849–1899), working in Vienna, isolated it in quantity and described its chemical properties for the first time. Because Weidel had made it from nicotine, the new acid was named nicotinic acid — a name that, as the section above explains, would cause trouble much later.

It is worth being clear about what Weidel did and did not do. He was a pure chemist studying the breakdown products of an alkaloid; he had no idea the substance was a nutrient, and he made no medical claim about it. His achievement was to characterise a new compound and give it a name. For more than sixty years after Weidel's work, nicotinic acid remained a chemical curiosity with no known biological purpose — a reagent on a shelf. The discovery that mattered for human health was still decades away, and it would come from an entirely different direction: the search for the causes of deficiency diseases.

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Casimir Funk, "Vitamine," and the Molecule He Set Aside (1912)

The next chapter belongs to one of the founding figures of nutrition science: the Polish-born biochemist Casimir Funk (1884–1967). In 1912, working at the Lister Institute in London, Funk proposed the term "vitamine" — from "vital" plus "amine" — for the trace organic substances he believed were responsible for preventing diseases such as beriberi, scurvy, rickets, and pellagra. (The final "e" was later dropped, giving the modern word vitamin, once it became clear that not all of these substances are amines.) Funk's broader idea — that several terrible diseases were each caused by the lack of a specific dietary factor — was one of the most important hypotheses in the history of medicine.

Here the story takes its remarkable turn. While hunting for the substance in rice bran (rice polishings) that cured beriberi, Funk around 1911–1912 isolated nicotinic acid — the very same compound Weidel had described in 1873. But when he tested it, it did not cure beriberi (that disease, we now know, is caused by a deficiency of a different vitamin, B1 / thiamine). Having found that his isolated compound did not solve the problem in front of him, Funk set it aside. He had, without knowing it, isolated Vitamin B3 a full quarter-century before its true role was understood. It is one of the clearest examples in all of nutrition history of the right answer to a question nobody had yet thought to ask.

Funk should be credited honestly for what he did: he coined the vitamine concept that organised the whole field, and he physically isolated nicotinic acid early. What he did not do — and never claimed to do — was identify it as the pellagra cure; the disease he was chasing was a different one. That final, decisive connection waited for the laboratory work of the 1930s.

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Pellagra: The Deficiency Disease That Drove the Search

To understand why anyone cared about an obscure acid, you have to understand pellagra. The disease was named in eighteenth-century Italy from the words for "rough skin" (pelle agra), and it became one of the great mass killers of the modern era. It is classically described by the "Four D's": dermatitis (a painful, sunburn-like rash on exposed skin), diarrhoea, dementia (confusion, depression, and psychosis), and, if untreated, death. Pellagra appeared wherever people lived on a diet dominated by maize (corn), and in the early twentieth century it exploded across the southern United States, where it killed and disabled enormous numbers of poor mill-workers, sharecroppers, and the institutionalised.

For a long time pellagra was blamed on an infection, a germ, or a toxin in spoiled corn. The crucial clue, understood only later, lay in how corn is prepared. Maize does contain niacin, but in a chemically bound form the human gut cannot absorb — unless the corn is treated with an alkali, the traditional Mesoamerican process called nixtamalization (soaking corn in limewater, as when making tortillas). Cultures that adopted corn with this processing largely escaped pellagra; cultures that adopted corn without it — much of Europe and the American South — suffered epidemics. This is the deficiency-disease backdrop against which the discovery of niacin must be read: a molecule that turned out to be the difference between health and a horrifying, fatal illness for whole populations.

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Joseph Goldberger Proves It Is the Diet, Not a Germ

The man who proved that pellagra was a dietary disease rather than an infection was Dr. Joseph Goldberger (1874–1929), a physician with the U.S. Public Health Service. In 1914, Surgeon General Rupert Blue assigned Goldberger to investigate the southern pellagra epidemic. Studying orphanages, prisons, and mill towns, Goldberger noticed something the "germ" theory could not explain: the inmates and children fell ill, but the doctors, nurses, and staff who lived and worked among them every day never caught it. An infection does not behave that way; a dietary deficiency does. He found he could produce pellagra in prison volunteers by feeding them a poor, corn-heavy diet, and cure it by improving the food.

To demolish the contagion theory once and for all, Goldberger and his colleagues carried out a now-famous series of self-experiments sometimes called the "filth parties." In 1916 he, his wife Mary, and volunteers deliberately exposed themselves to material from pellagra patients — swallowing and being injected with it — to show that the disease could not be transmitted. They did not develop pellagra. Goldberger concluded, correctly, that pellagra was caused by the lack of some factor in the diet, which he and others called the "P-P" (pellagra-preventive) factor.

Goldberger had the right answer in principle, but he never managed to chemically identify the missing factor, and he died in 1929 — eight years before nicotinic acid was unmasked as the P-P factor. His role in the discovery story is honest and central: he proved that pellagra was a deficiency disease and pointed the search in exactly the right direction, even though the molecular answer came only after his death. Among historians of medicine he is widely regarded as having done the decisive epidemiological work; that he is sometimes mentioned as a Nobel contender who died too soon reflects how highly that work is rated, though prizes are not awarded posthumously.

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The Breakthrough: Conrad Elvehjem and Black Tongue (1937)

The decisive discovery came in 1937, at the University of Wisconsin–Madison, in the laboratory of the biochemist Conrad Arnold Elvehjem (1901–1962). The key tool was an animal model: dogs fed a poor diet developed a condition called "black tongue," which is essentially the canine equivalent of human pellagra. This gave researchers a way to test candidate substances directly — feed the extract, and see whether the sick dog recovered.

Elvehjem and his co-workers extracted an active substance from liver and showed that it cured black tongue in dogs — then identified that substance as nicotinic acid (and its amide, nicotinamide). The crystallisation and identification were carried out with his colleagues Robert J. Madden, Frank M. Strong, and D. Wayne Woolley. Their landmark paper, "The Isolation and Identification of the Anti-Black Tongue Factor," was received in December 1937 and published in the Journal of Biological Chemistry (volume 123, pages 137–149). The molecule that Funk had isolated and discarded twenty-five years earlier, and that Weidel had first named in 1873, was at last revealed as the cure for one of the deadliest deficiency diseases on Earth.

The discovery moved with extraordinary speed from dogs to people. Within months, American physicians — notably Tom Douglas Spies, working with Marion Blankenhorn and Clark Cooper — gave nicotinic acid to human pellagra patients and watched the disease melt away, often within days. A condition that had killed and maddened hundreds of thousands of people turned out to be curable with a few cents' worth of a simple chemical. This is the heart of Vitamin B3's history: a named scientist, a specific year, a published paper, and a deficiency disease conquered.

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From "Nicotinic Acid" to "Niacin" (1942)

Once nicotinic acid was known to prevent a fatal disease, public-health authorities wanted to add it to staple foods — above all to bread and flour, the same enrichment programme that helped end pellagra as a mass killer. But there was an obvious public-relations problem: a vitamin added to the family loaf was called nicotinic acid, a name that sounded alarmingly like nicotine. People might fear they were eating tobacco poison.

The solution was a new name. In 1942, the Council on Foods and Nutrition of the American Medical Association approved the names "niacin" and "niacinamide." "Niacin" was coined from NIcotinic ACid plus vitamIN — a deliberately reassuring word chosen precisely to dissociate the vitamin from nicotine and avoid frightening the public. The renaming is a small but genuine part of the discovery story, and it explains why the same vitamin carries so many names: the old chemical name (nicotinic acid), the friendly food-label name (niacin), and the modern vitamin designation (Vitamin B3).

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The Deeper Discovery: Niacin Becomes NAD

The cure for pellagra was only half the discovery. The other half — why the body needs niacin at all — came from a separate line of research into how cells turn food into energy, and it connects niacin's story to a Nobel Prize. Niacin is the raw material the body uses to build nicotinamide adenine dinucleotide (NAD) and its relative NADP, two coenzymes that are absolutely central to metabolism.

The trail began in 1906, when the British biochemists Arthur Harden and William John Young showed that yeast fermentation needed a small, heat-stable helper molecule they called "cozymase" — the substance later identified as NAD. For this and related work on fermentation, Harden shared the 1929 Nobel Prize in Chemistry with the Swedish biochemist Hans von Euler-Chelpin, awarded (in the Nobel committee's words) "for their investigations on the fermentation of sugar and fermentative enzymes"; von Euler-Chelpin had worked out much of cozymase's structure. In the 1930s the German biochemist Otto Warburg — himself a Nobel laureate — showed that the nicotinamide part of this coenzyme is the working component that actually carries hydrogen (electrons) in the chemical reactions that release energy from food.

It was the convergence of these two stories that completed the picture. The energy researchers had found a vital coenzyme without knowing where its key ingredient came from; the pellagra researchers had found a vitamin without fully knowing why it was essential. By the late 1930s it was clear that they were describing the same thing from opposite ends: the vitamin niacin is the dietary precursor the body assembles into the coenzyme NAD. That is why a niacin deficiency is so devastating — without it, cells cannot make the molecule they need to extract energy from food, and tissues with high energy demands, such as the skin, gut, and brain, fail in exactly the pattern of pellagra's Four D's.

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The Tryptophan Twist (1945)

One last discovery rounded out the science and explained a puzzle that had nagged researchers for years: why some people on corn-heavy diets escaped pellagra while others did not. In 1945, work led by Willard Krehl and colleagues (again from the Wisconsin school of nutrition) demonstrated that the body can manufacture niacin from the amino acid tryptophan, found in protein-rich foods. In other words, niacin is only "conditionally" essential: a diet with enough good-quality protein can supply tryptophan that the body converts into niacin, partly covering its own needs.

This explained the epidemiology of pellagra beautifully. Diets built on corn are poor in both available niacin and tryptophan, so they fail on two fronts at once — which is why corn-dependent populations were hit so hard. The discovery also led to the modern way of measuring the vitamin in "niacin equivalents," which counts both preformed niacin and the contribution from dietary tryptophan. It was a fitting capstone: the molecule first made from nicotine, set aside by Funk, and rescued by Elvehjem turned out to be one the body could even build for itself, given the right food.

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Legacy: From Famine Disease to Longevity Science

The practical legacy of these discoveries was immediate and enormous. Once nicotinic acid was identified and cheap to produce, the enrichment of flour and bread with niacin (alongside other B vitamins) helped drive pellagra — once a mass killer — to near-extinction in the developed world within a generation. Few discoveries in nutrition have saved so many lives so quickly, and pellagra today appears mainly in the settings the history would predict: severe alcoholism, malabsorption, certain medications, and diets dangerously poor in both niacin and protein.

The story did not end there, and this is the striking thing about Vitamin B3: the molecule has stayed at the frontier of research for nearly a century. Because niacin builds NAD, and because NAD turns out to be central not only to energy metabolism but to DNA repair, gene regulation, and the biology of aging, the humble vitamin that cured pellagra now sits at the heart of modern longevity science. The detailed mechanisms, the different supplemental forms, dosing, and the evidence for niacin's many modern uses are covered in the companion Vitamin B3 Benefits articles and on the main Vitamin B3 page; this history is concerned with how it was discovered in the first place.

The honest summary is a tribute to many hands. A nineteenth-century chemist named the molecule; Casimir Funk isolated it and named the very idea of vitamins; Joseph Goldberger proved the disease was dietary; Elvehjem, Madden, Strong, and Woolley connected molecule to cure; physicians like Tom Spies carried it to patients; and a separate lineage of Nobel-winning biochemists revealed why the body needs it at all. No single person "invented" Vitamin B3 — but the chain of named, datable, verifiable discoveries that turned a laboratory curiosity into a life-saving vitamin is one of the great success stories of modern science.

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Research Papers and References

The list below combines key peer-reviewed historical reviews of niacin and the discovery of vitamins with curated PubMed topic-search links and authoritative resources. Author names, titles, and journals are given as plain text; only the stable DOI, PMID, or archive link is hyperlinked, and each opens in a new tab. The original 1937–1938 Elvehjem paper is named in the article as a historical primary source; the entries below include modern commentaries and reprints that document it.

  1. Elvehjem CA, Madden RJ, Strong FM, Woolley DW. The isolation and identification of the anti-black tongue factor. Journal of Biological Chemistry. 1938;123:137–149. (Landmark paper identifying nicotinic acid as the pellagra-preventive / anti-black-tongue factor; received December 1937.) Reprinted with commentary: Nutrition Reviews. 1974;32(2):48–50. — doi:10.1111/j.1753-4887.1974.tb06263.x
  2. Simoni RD, Hill RL, Vaughan M. Copper as an essential nutrient and nicotinic acid as the anti-black tongue (pellagra) factor: the work of Conrad Arnold Elvehjem. Journal of Biological Chemistry. 2002;277(34):e22. — PMID: 12185207
  3. Spedding S. Vitamins are more Funky than Casimir thought. Australasian Medical Journal. 2013;6(2):104–106. (On Casimir Funk and the centenary of the vitamine concept.) — doi:10.4066/AMJ.2013.1588
  4. Henderson LM. Tryptophan's role as a vitamin precursor (Krehl et al., 1945). Journal of Nutrition. 1997;127(5 Suppl):1043S–1045S. (Historical commentary on the discovery that the body converts tryptophan to niacin.) — PMID: 9164303
  5. The Nobel Prize in Chemistry 1929 — Arthur Harden and Hans von Euler-Chelpin, "for their investigations on the fermentation of sugar and fermentative enzymes." — NobelPrize.org — Chemistry 1929
  6. Niacin discovery, pellagra, and the history of Vitamin B3 — PubMed: niacin and pellagra history
  7. Joseph Goldberger and the dietary causation of pellagra — PubMed: Goldberger and pellagra

External Authoritative Resources

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Connections

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