Vitamin generic descriptor name Vitamer chemical name(s) or chemical class of compounds (list not complete) Vitamin A1 all-trans-Retinol, retinal, and alternative carotenoids: the provitamin A carotenoids alpha-carotene, beta-carotene, gamma-carotene; and the xanthophyll beta-cryptoxanthin Vitamin B1 Thiamine, Thiamine monophosphate,[3] Thiamine pyrophosphate Vitamin B2 Riboflavin, Flavin mononucleotide (FMN), Flavin adenine dinucleotide (FAD) Vitamin B3 Niacin, niacinamide, Nicotinamide riboside Vitamin B5 Pantothenic acid, panthenol, pantethine Vitamin B6 Pyridoxine, pyridoxine phosphate, pyridoxamine, pyridoxamine phosphate, pyridoxal, pyridoxal 5-phosphate Vitamin B7 Biotin Vitamin B9 Folic acid, folinic acid, 5-Methyltetrahydrofolate Vitamin B12 Cyanocobalamin, hydroxocobalamin, methylcobalamin, adenosylcobalamin Vitamin C Ascorbic acid, dehydroascorbic acid, calcium ascorbate, sodium ascorbate, other salts of ascorbic acid Vitamin D Calcitriol, ergocalciferol (D2), cholecalciferol (D3) Vitamin E Tocopherols (d-alpha, d-beta, d-gamma, and d-delta-tocopherol), tocotrienols (alpha, beta, gamma, delta tocotrienols) Vitamin K phylloquinone(K1), menaquinones (K2), menadiones (K3)