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Milk Milk is an excellent source of riboflavin (B2) and cobalamin (B12).—Colleen Doherty, Verywell Health, 14 Feb. 2026 Beef is an excellent source of vitamin B12 (cobalamin).—Joy Emeh, Health, 9 Jan. 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 Vitamin B12, also known as cobalamin, is a nutrient that plays an important role in the normal functioning of your body.—Amber Smith, Discover Magazine, 9 Nov. 2022