B12 (cobalamin) is a water-soluble vitamin essential for various bodily functions. It plays a crucial role in the formation of red blood cells, DNA synthesis, and maintaining the health of nerve cells. B12 is primarily found in animal products such as meat, fish, eggs, and dairy, making it important for those following a vegetarian or vegan diet to consider supplementation. A deficiency in B12 can lead to anemia, fatigue, and neurological issues. The body absorbs B12 through a complex process involving intrinsic factor, a protein produced in the stomach. Regular intake of B12 is vital for overall health and well-being.