Vitamin B1 to B12: The Complete List of B Vitamin Names, Explained

If you've ever looked at a supplement label and wondered why the numbers jump from B3 straight to B5, skipping B4 entirely, you're asking exactly the right question. It's one of the most common points of confusion in nutrition, and the honest answer is more interesting than a typo: "vitamin B" was never one vitamin. It's a family of eight distinct nutrients, each with its own name, its own job in the body, and its own number. This is the complete list, in plain terms, from B1 to B12, along with the real story of how it came together.

The Discovery Story: How One "Vitamine" Became Eight

The story starts with a disease, not a vitamin. In the late 1800s, Dutch physician Christiaan Eijkman was working in Java, investigating an outbreak of beriberi, a condition that caused weakness, paralysis, and sometimes death. He noticed something odd: laboratory chickens fed polished white rice developed beriberi-like symptoms, while chickens fed unpolished rice did not. The husk being milled away, it turned out, was removing something the body needed.

In 1906, English biochemist Frederick Gowland Hopkins proposed that food contained "accessory factors" beyond fat, protein, and carbohydrate, substances the body required in tiny amounts to stay healthy. A few years later, in 1911, Polish biochemist Casimir Funk built on that idea and coined the term "vitamine," from "vital amine," to describe whatever it was in rice bran that prevented beriberi. In 1926, two Dutch chemists, Barend Jansen and Willem Donath, finally isolated and crystallized that anti-beriberi compound. It would later be named thiamine, or vitamin B1, and its structure was confirmed and synthesized in 1936. Eijkman and Hopkins shared the 1929 Nobel Prize in Physiology or Medicine for the discovery of vitamins.

Here's where the numbering gets interesting. Researchers initially believed rice bran contained just two factors: an unstable, heat-sensitive one (which became B1) and a second, heat-stable one they called "vitamin B2." But as they studied that second factor more closely, they realized it wasn't one substance either. It was several: niacin, biotin, pantothenic acid, and riboflavin, all tangled together in the same extract. Each had to be separated out and identified individually, and each investigation told its own story.

Niacin's story ran through a disease called pellagra, which caused severe skin, digestive, and neurological symptoms and killed thousands of people across the southern United States in the early twentieth century. Physician Joseph Goldberger spent the 1910s and 1920s proving, against considerable resistance, that pellagra was caused by diet rather than infection. He died in 1929, just before biochemist Conrad Elvehjem isolated the specific compound responsible in 1937: niacin.

Folate's story belongs largely to Lucy Wills, a British hematologist who traveled to Bombay in the late 1920s to investigate a severe, often fatal anemia affecting pregnant textile workers. She found that a cheap, widely available food, yeast extract, could prevent and reverse it, even though the standard treatment for anemia at the time (a purified liver extract) did not work as well. The nutrient responsible was isolated from spinach leaves in 1941 and became known as folate, from the Latin "folium," or leaf.

The last piece of the puzzle, B12, has perhaps the most dramatic origin story. In the 1920s, researcher George Whipple showed that feeding liver to anemic dogs restored their red blood cell counts. Physicians George Minot and William Murphy applied the same idea to patients with pernicious anemia, a disease that was, at the time, almost always fatal, and found that a diet built around liver reversed it. The three shared the 1934 Nobel Prize for the discovery, but the actual compound responsible for the cure remained unidentified for another fourteen years. It was finally isolated in 1948, independently and within weeks of each other, by research teams at Merck in the United States and Glaxo in Britain. Its full molecular structure, one of the most complex of any vitamin, wasn't mapped until chemist Dorothy Hodgkin worked it out in the 1950s, a feat that later earned her the Nobel Prize in Chemistry.

By 1948, the picture was essentially complete. Eight distinct, essential B vitamins had been identified, isolated, and confirmed, which is exactly why the family stops at B12 despite the gaps in the numbering. The missing numbers aren't unfinished business. They're the record of a science correcting itself as it went.

The Complete List: Every B Vitamin From B1 to B12

Here's the full lineup at a glance, followed by a closer look at each one.

Vitamin B1 (Thiamine)

Thiamine is one of the first vitamins involved in turning carbohydrates into usable energy, and it also plays a role in healthy nerve signaling. It's found naturally in whole grains and legumes, though it's stripped out during the refining of white rice and white flour, which is worth knowing given how common refined grains are in everyday Gulf diets. We go into more depth on thiamine's role alongside B6 and B12 in our B complex breakdown.

Vitamin B2 (Riboflavin)

Riboflavin works closely with several other B vitamins as a coenzyme, meaning it helps other reactions happen rather than doing a single job on its own. It's central to how your cells generate energy from food, and it also supports normal vision and skin health. Riboflavin is fairly easy to get from a varied diet since it shows up in dairy, eggs, lean meats, and leafy greens, and it's one of the reasons milk cartons used to avoid clear packaging: riboflavin breaks down when exposed to prolonged light.

Vitamin B3 (Niacin)

Niacin is directly involved in more than 400 enzymatic reactions in the body, more than any other vitamin, most of them tied to energy metabolism and DNA repair. It also supports healthy skin and the nervous system. What makes niacin somewhat unique among the B vitamins is that your body can make a small amount of it from the amino acid tryptophan, though not enough to meet your full needs, so dietary intake still matters. Poultry, fish, whole grains, and peanuts are reliable sources.

Vitamin B5 (Pantothenic Acid)

The name comes from the Greek word for "everywhere," and that's a fair description of how widely pantothenic acid occurs in food. It's a building block for coenzyme A, a molecule your body relies on constantly to metabolize fats, carbohydrates, and protein into energy, and it also plays a role in producing certain hormones and cholesterol. Because it's so widespread in food, from chicken and beef to potatoes, oats, and tomatoes, genuine dietary deficiency is rare.

Vitamin B6 (Pyridoxine)

Pyridoxine helps the body manufacture neurotransmitters, including serotonin and dopamine, and works alongside B12 and folate to regulate homocysteine, a compound linked to long-term cardiovascular health. It supports immune function and normal brain development as well.

Vitamin B7 (Biotin)

Biotin supports fatty acid synthesis and amino acid metabolism, and it's the B vitamin most associated in popular culture with hair, skin, and nail health, largely thanks to supplement marketing rather than strong clinical evidence for people who aren't actually deficient. Genuine biotin deficiency is uncommon, since it's present in eggs, salmon, dairy, nuts, and seeds, though eating a lot of raw egg whites can interfere with absorption due to a protein called avidin, which is one reason cooked eggs are the more reliable source. If you're curious about biotin's much-discussed role in hair, skin, and nails specifically, we've covered that in more depth in our dedicated biotin guide.

Vitamin B9 (Folate / Folic Acid)

Folate is the form found naturally in food, while folic acid is the synthetic form used in fortified foods and most supplements, including multivitamins. Both are essential for DNA synthesis and cell division, which is why folate intake matters so much during pregnancy for healthy fetal development, and for ongoing red blood cell production throughout life. Leafy greens, legumes, asparagus, and citrus fruit are strong natural sources, alongside fortified breads and cereals. One caveat worth knowing: very high folic acid intake can mask the blood-related warning signs of a B12 deficiency without addressing the underlying nerve-related risk, which is one more reason unexplained fatigue or persistent tiredness is worth a proper blood panel rather than guesswork.

Vitamin B12 (Cobalamin)

B12 keeps nerve cells healthy, supports DNA production, and is essential for forming red blood cells. Unlike most other B vitamins, it occurs naturally only in animal products: meat, fish, eggs, and dairy, which is exactly why anyone eating a largely plant-based diet needs a fortified source or a supplement to fill the gap. If constant tiredness is what brought you here, we go much deeper into the specific link between B12 and energy levels in our dedicated guide to B12 and fatigue.

Food Sources in the Real World: Cooking Losses and Bioavailability

Knowing which foods contain which B vitamin is only part of the picture. How you store, prepare, and cook those foods can change how much of the vitamin actually reaches your body, sometimes significantly.

Folate is the most dramatic example. Because it's both heat-sensitive and water-soluble, boiling leafy greens like spinach can destroy anywhere from roughly half to as much as three-quarters of their folate content, most of it simply leaching into the cooking water. Steaming preserves substantially more. Interestingly, the synthetic folic acid used in fortified foods and supplements is more heat-stable and more efficiently absorbed than natural food folate, which is part of the reason public health fortification programs use folic acid rather than trying to preserve natural folate through processing.

Niacin has its own bioavailability quirk tied directly to its discovery. Corn naturally contains niacin, but in a bound form the human digestive system can't easily access. Indigenous communities across the Americas had long treated corn with an alkaline solution, a process called nixtamalization, which happens to release that bound niacin and make it usable. Cultures that adopted corn as a dietary staple without adopting that preparation method, including parts of the southern United States and southern Europe in the nineteenth and early twentieth centuries, saw pellagra epidemics as a direct result.

Riboflavin's main vulnerability is light rather than heat, which is why dairy products have traditionally been sold in opaque rather than clear packaging. Thiamine is sensitive to both heat and refining, which is why whole grains retain meaningfully more of it than their processed counterparts. Biotin, by contrast, is quite heat-stable; its main absorption barrier is specific to eating a large amount of raw egg white, not to cooking in general. And B12's availability has nothing to do with cooking at all. It's governed almost entirely by a protein called intrinsic factor, produced in the stomach, which the body needs in order to absorb B12 regardless of how the food containing it was prepared.

Where Are B4, B8, B10, and B11? The Numbering Gap Explained

This is usually the real question behind "vitamin B1 to B12," and it has a straightforward answer. Each of the missing numbers was originally assigned, in the early twentieth century, to a compound researchers believed met the strict definition of a vitamin: essential for health, and something the human body can't produce on its own. Later research overturned that for each one, for slightly different reasons.

B4 was assigned to adenine, which turned out to be a building block of DNA that the body manufactures itself. B8 went to inositol, a compound involved in cell signaling that the body can also synthesize and that's abundant across ordinary foods, so a deficiency is essentially unheard of. B10 and B11 were both eventually reclassified as well, for similar reasons: either the body could make them, or later research showed they didn't meet the bar for essential status. As Cleveland Clinic puts it, those four numbers simply didn't hold up to closer scrutiny, in much the same way Pluto no longer holds up as a planet. What's left is a clean, confirmed list of eight, and that's the list that matters for anyone reading a label or trying to understand what a supplement actually contains.

What Daily Essentials Actually Provides for Each B Vitamin

Vitameenat's Daily Essentials box includes all eight B vitamins in its daily MultiVitamin sachet. Here's exactly what that looks like, using the standard EU reference intake (RI) as the benchmark:

A few of these, particularly B1 at 136.4% and folic acid at 250%, sit noticeably above 100%. That's worth explaining rather than glossing over. Because B vitamins are water-soluble, your body doesn't store the surplus. Anything beyond what it needs at a given moment is simply excreted rather than accumulated, which is a very different situation from fat-soluble vitamins like A or D, where excess really can build up over time. Formulating slightly above 100% on several B vitamins isn't about maximizing dose, it's a buffer that accounts for how differently people actually eat day to day. The formula is built around covering that gap consistently, not around exceeding what the body can use.

B12 is worth a closer look, since it's the one figure on this list that isn't a single number. Daily Essentials includes 2mcg of vitamin B12 as cyanocobalamin. Measured against the general EU Nutrient Reference Value of 2.5mcg, that works out to 80 percent. But Daily Essentials' own label uses a stricter benchmark: the European Food Safety Authority's biomarker-based Adequate Intake of 4mcg per day, against which the same 2mcg dose is 50 percent, which is the figure actually printed on the box. Both figures are accurate; they're simply measured against two different official reference points. Either way, the dose sits well within the range shown to support normal energy metabolism, alongside the other core nutrients most people's diets tend to underdeliver on.

Frequently Asked Questions

Are folate and folic acid the same thing?

Not exactly. Folate is the natural form found in food, while folic acid is the synthetic form used in fortified foods and most supplements. They do the same job in the body, but folic acid is more stable during processing and is absorbed somewhat more efficiently.

Do I need to take all eight B vitamins together?

Not necessarily. Most people eating a varied diet get adequate amounts of most B vitamins from food. A daily multivitamin covering all eight is a reasonable baseline for anyone whose diet is inconsistent, while specific gaps, like B12 for someone eating little animal protein, may call for a more targeted approach.

Why do B vitamins need to be replenished daily instead of occasionally?

Because they're water-soluble, the body doesn't store meaningful reserves of most B vitamins the way it does with fat-soluble vitamins like A, D, E, and K. Whatever isn't used is excreted, generally within a day or two, so consistent intake matters more than occasional large doses.

Does cooking destroy B vitamins?

It can, particularly for folate and thiamine, both of which are sensitive to heat and leach into cooking water. Steaming, roasting, and quick cooking methods generally preserve more B vitamins than prolonged boiling.

Is there a vitamin B4, B8, B10, or B11 I should be looking for?

No. Those numbers were assigned to compounds decades ago that were later found not to meet the definition of an essential vitamin, either because the body can produce them itself or because further research didn't support their essential status. The confirmed, current list runs from B1 to B12 with eight vitamins total.

The Takeaway

"Vitamin B" was never one thing. It's eight separate nutrients, each with a real name, a specific job, and its own place in your diet, discovered piece by piece over nearly four decades of medical detective work. The numbering gaps at B4, B8, B10, and B11 simply reflect those decades-old corrections rather than anything missing from your supplement. If you're trying to decide whether you actually need a standalone B12 supplement or a full B complex covering all eight, we walk through that specific decision here. And if it's ongoing fatigue that brought you to this page in the first place, it's worth ruling out the bigger picture, sleep, stress, iron levels, and thyroid function, with an actual blood test before assuming any single vitamin is the answer.

Reviewed by Fatima Kassem — pharmacist and founder of Vitameenat, MSc in Pharmaceutical Sciences from the University of Copenhagen, with early career experience at Novo Nordisk.