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Beef is an excellent source of vitamin B12 (cobalamin).—Joy Emeh, Health, 2 June 2026 Milk Milk is an excellent source of riboflavin (B2) and cobalamin (B12).—Colleen Doherty, Verywell Health, 14 Feb. 2026 It’s made up of eight smaller vitamins: thiamine (vitamin B1), riboflavin (vitamin B2), niacin (vitamin B3), pantothenic acid (vitamin B5), pyridoxine (vitamin B6), biotin, folic acid, and cobalamins (vitamin B12).—Perri O. Blumberg, Men's Health, 30 June 2023