Solgar Vitamin B12 promotes the health of the circulatory and nervous systems. B12 is a naturally occurring B-complex vitamin. Each nutrient in the B-vitamin complex performs a unique role in maintaining proper metabolic functioning and is essential for well-being. Vitamin B12 supports energy metabolism by working with enzymes involved in the breakdown of nutrients, such as amino acids. It is also vital for the normal formation of blood cells, and is involved in DNA synthesis and renewal.