Cysteine ????b? otu n'ime ihe nd? d? na glutathione, nke nwere ike ime ka ?ka nká nke radicals efu. Cysteine ????nwere ike ?gbanwe site na methionine n'ime ah?, usoro a na-ach?kwa itinye aka na vitamin B6. Ka ? d? ugbu a, mgbe ejiri ya na selenium na vitamin E, cysteine ??nwere ike ?r? ?r? kachas? mma. T?kwas? na nke ah?, cysteine ??nwere nnukwu s?lf?, nke na-enyere aka wep? ihe nd? na-egbu egbu iji chebe mkp?r? nd?.