IiVithamini zizinto ezibalulekileyo zokugcina ubomi kunye nempilo.Yinto ebalulekileyo kwizinja ukugcina ubomi, ukukhula nokuphuhlisa, ukugcina imisebenzi eqhelekileyo yomzimba kunye nemetabolism.Iivithamini azibalulekanga kangako kwisondlo sezinja kuneprotheyini, amafutha, iicarbohydrates kunye neeminerali.Nangona iivithamini zingengomthombo wamandla kwaye zingengowona mthombo wamandla oyinxalenye yezicubu zomzimba, indima yazo ikwiempawu zazo zebhayoloji.Ezinye iivithamini zizinto zokwakha ii-enzymes;ezinye ezifana nethiamine, riboflavin, kunye neniacin zenza iicoenzymes kunye nezinye.Ezi enzymes kunye ne-coenzymes zibandakanyeka kwinkqubo yokusabela kweekhemikhali kwiinkqubo ezahlukeneyo ze-metabolic yenja.Ke ngoko, idlala indima ebaluleke kakhulu kwimetabolism yeeprotheyini, amafutha, iicarbohydrates, iityuwa ezingaphiliyo kunye nezinye izinto emzimbeni.