Vitamin B12 is part of the B family of vitamins. Cyanocobalamin is the most common form of Vitamin B12. Vitamin B-12 is important for the normal functioning of the brain and nervous system and for the formation of blood. It is normally involved in the metabolism of every cell of the body, especially affecting the DNA synthesis and regulation but also fatty acid synthesis and energy production.
Vitamin B-12 is naturally found in foods of animal origin including meat (especially liver and shellfish) and milk products.