| Noun | 1. | B-complex vitamin - originally thought to be a single vitamin but now separated into several B vitaminscholine - a B-complex vitamin that is a constituent of lecithin; essential in the metabolism of fat inositol - an optically inactive alcohol that is a component of the vitamin B complex pantothen, pantothenic acid - a vitamin of the vitamin B complex that performs an important role in the oxidation of fats and carbohydrates and certain amino acids; occurs in many foods water-soluble vitamin - any vitamin that is soluble in water aneurin, antiberiberi factor, thiamin, thiamine, vitamin B1 - a B vitamin that prevents beriberi; maintains appetite and growth antipernicious anemia factor, cobalamin, cyanocobalamin, vitamin B12 - a B vitamin that is used to treat pernicious anemia hepatoflavin, lactoflavin, ovoflavin, riboflavin, vitamin B2, vitamin G - a B vitamin that prevents skin lesions and weight loss adermin, pyridoxal, pyridoxamine, pyridoxine, vitamin B6 - a B vitamin that is essential for metabolism of amino acids and starch folacin, folate, folic acid, pteroylglutamic acid, pteroylmonoglutamic acid, vitamin Bc, vitamin M - a B vitamin that is essential for cell growth and reproduction niacin, nicotinic acid - a B vitamin essential for the normal function of the nervous system and the gastrointestinal tract |