Cysteine ????ndi chimodzi mwa zigawo za glutathione, zomwe zimatha kufulumizitsa ukalamba wa ma free radicals. Cysteine ??ikhoza kusinthidwa kuchokera ku methionine m'thupi, ndipo izi zimafuna kutengapo gawo kwa vitamini B6. Panthawiyi, cysteine ????imatha kugwira ntchito limodzi ndi selenium ndi vitamini E. Komanso, cysteine ??ali mkulu kuchuluka kwa sulfure, amene amathandiza kuchotsa poizoni zinthu kuteteza maselo.