Nutricost Vitamin B12 (Methylcobalamin) 5000mcg, 240 Capsules Non-GMO Exp. 4/26. Vitamin B12, also known as cobalamin is a member of the B vitamin family which your body uses to build red blood cells.* Red blood cells carry oxygen and nutrients to our muscles. It also helps break down proteins, fats, and carbohydrates, serving a vital role in maintaining the body’s energy supply. Thanks for looking.