Sources and Functions. Vitamin B12, or cobalamin, is a water-soluble vitamin present in foods eggs and milk products. Some foods are also fortified with vitamin B12. With the exception of algae and miso, very few plants contain this vitamin.

Sources and Functions. Vitamin B₁₂, or cobalamin, is a water-soluble vitamin present in foods of animal origin, such as eggs and milkproducts. Some foods are also fortified with vitamin B₁₂. With the exception of algae and miso, very few plants contain this vitamin.