Vitamin D helps build bone development and strength. Its sources are sunlight, fortified milk and milk products, fish-liver |oils|, egg yolks, organ meats such as |liver|, tuna, salmon, and cod |liver| oil. The USRDA for an adult male is 5 micrograms (mcg.), for an adult female 5 mcg., for adolescents 10 mcg., and for infants and young children 10 mcg.
