Adenosylcobalamin, also known as coenzyme B12, is a form of vitamin B12 that plays a crucial role in cellular metabolism. It is essential for the conversion of certain fatty acids and amino acids into energy, supporting the proper functioning of the nervous system and the formation of red blood cells. This vitamin is naturally found in animal products, such as meat, fish, and dairy. Deficiency in adenosylcobalamin can lead to various health issues, including anemia and neurological problems. Supplementation may be necessary for individuals with absorption issues or those following a strict vegan diet.