The Bio-Available brand of vitamin supplements sells vitamin B-12 tablets at VitaminWorld.com. Bio-Available's B-12 formula also comes fortified with folic acid, vitamin C and biotin.
Vitamin B-12 is available naturally in many animal foods, such as poultry, dairy, organ meats and shellfish, according to Medline Plus. Plant foods, however, are not a good source of Vitamin B-12, and the human body does not absorb the kind of B-12 that plants produce very well. Vitamin B-12 is water soluble and can be stored in the liver for years. It plays an important role in metabolism and in the creation of red blood cells.