B10

B10 is a historical and nonstandard label that has appeared in some nutrition literature as part of the B-complex vitamin group. It is not consistently defined across sources and is not recognized as an essential nutrient by major health authorities such as the NIH Office of Dietary Supplements or EFSA.

In older texts, B10 most often referred to para-aminobenzoic acid (PABA), a compound found in foods and available as a supplement. PABA is involved in folate synthesis in bacteria, but humans do not require it as a vitamin, and the designation B10 has largely fallen out of use in modern nutrition.

Other occasional usages of the B10 label have identified different molecules, but there is no single universally accepted chemical identity for B10 today. Contemporary nutrition practice does not rely on B10 as an established nutrient, and there is no official daily value or recommended intake associated with it.

Dietary intake recommendations do not include a B10 value, reflecting its status as an informal or historical designation rather than a defined essential nutrient. Supplements labeled as containing B10 (often PABA-containing products) are not universally recommended and may carry risks such as adverse reactions or photosensitivity at high doses. Users should consult reliable sources or healthcare professionals before considering such supplements.

See also: vitamin B complex, para-aminobenzoic acid, biotin.