The B Vitamin Family: An Overview
B vitamins are a group of eight water-soluble nutrients that work throughout the body — supporting energy production, red blood cell formation, nerve signaling, and DNA synthesis, among other functions. Because they are water-soluble, the body does not store most of them in significant amounts, which means regular dietary intake matters.
Despite being grouped together under the "B" label, each vitamin is chemically distinct and serves different purposes. Understanding what each one does — and which foods supply it — makes it easier to evaluate whether your everyday meals are covering your nutritional bases. For a broader look at why micronutrients matter overall, see how micronutrients work inside your body.
| Number of B vitamins | 8 distinct vitamins (National Institutes of Health, Office of Dietary Supplements) |
| Solubility type | Water-soluble |
| B vitamin most commonly deficient in vegans | Vitamin B12 (NIH Office of Dietary Supplements) |
| B vitamin critical during pregnancy | Folate (B9) (CDC Folic Acid Recommendations) |
| Primary shared function | Energy metabolism (converting food into usable fuel) |
| Key animal-only source | B12 found naturally only in animal-derived foods (USDA FoodData Central) |
Each B Vitamin: Function and Food Sources
The following breakdown covers all eight B vitamins, what role each plays, and where to find them in a typical diet.
Thiamin (B1)
Helps convert carbohydrates into energy and supports nerve and muscle function. Found in whole grains, pork, legumes, and fortified cereals.
Riboflavin (B2)
Plays a key role in energy production and helps the body process fats, drugs, and steroids. Good sources include dairy products, eggs, lean meats, and leafy greens.
Niacin (B3)
Supports energy metabolism and DNA repair, and contributes to healthy skin and nerve function. Found in poultry, fish, peanuts, whole grains, and fortified foods.
Pantothenic Acid (B5)
Essential for synthesizing coenzyme A, which is central to metabolizing nutrients for energy. Widely available in chicken, beef, potatoes, oats, and tomatoes.
Pyridoxine (B6)
Involved in over 100 enzyme reactions, including protein metabolism and the production of neurotransmitters like serotonin. Sources include poultry, fish, potatoes, bananas, and chickpeas.
Biotin (B7)
Supports the metabolism of fats, carbohydrates, and proteins, and plays a role in gene expression. Found in eggs (especially yolks), nuts, seeds, salmon, and sweet potatoes.
Folate (B9)
Critical for DNA synthesis, cell division, and the formation of red blood cells. Especially important before and during pregnancy. Rich sources include dark leafy greens, legumes, fortified grains, and oranges.
Cobalamin (B12)
Required for nerve function, red blood cell production, and DNA synthesis. Found naturally only in animal products such as meat, fish, dairy, and eggs; fortified foods and supplements are options for those who avoid animal products.
A note on deficiency: Most people eating a varied diet get adequate B vitamins, but certain groups — including older adults, people who are pregnant, strict vegans, and those with specific digestive conditions — may be at higher risk for shortfalls in certain B vitamins, particularly B12 and folate. If you have concerns about your intake or symptoms you associate with deficiency, consult a qualified healthcare provider before making significant dietary changes or starting supplements.
This article is for informational purposes only and is not a substitute for personalized medical or nutritional advice. Consult a qualified healthcare professional for guidance specific to your health situation.
