Cobal Gold 2500 man-made form of vitamin B12. It is used to treat deficiency of vitamin B12 in the body. Vitamin B12 is important for growth, cell reproduction, blood formation, and protein and tissue synthesis. It also helps to treat anemia, fatigue, and numbness or tingling in the hands and feet. Cobal Gold 2500 is a supplement vitamin B12. It is used to treat low levels of vitamin B12 in your body. Vitamin B12 is essential in the formation of red blood cells and helps in the absorption of iron in the body. It also helps your body use fat and carbohydrates for energy and make new protein. In combination with other vitamins, it helps in strengthening the immune system, improves the metabolism of the body, and is important for the nervous system.