Ma'anar ƙamus na kalmar antioxidant wani abu ne da ke hana oxidation, musamman wanda ake amfani da shi don magance tabarbarewar kayan abinci da aka adana. A cikin mafi sauƙi, antioxidant kwayoyin halitta ne wanda ke taimakawa hana ko rage jinkirin lalacewa ga kwayoyin halitta da kwayoyin cutarwa da aka sani da free radicals. Ana iya samun antioxidants ta halitta a wasu abinci ko ana iya ɗaukar su azaman kari. An yi imanin cewa suna da fa'idodin kiwon lafiya kamar rage haɗarin cututtuka na yau da kullun kamar cututtukan zuciya, ciwon daji, da Alzheimer's.