Vitamin B-12 is needed to form red |blood cells|, and helps build genetic material and the nervous system functions. Its sources are |liver|, meat, fish, eggs, soybeans, |kidneys|, milk, and oysters. The USRDA for an adult male is 3 micrograms (mcg.), for an adult female 3 mcg., for adolescents 3 mcg., and for infants and young children 0.3-3 mcg.
