I-Cysteine ????yenye yamacandelo e-glutathione, enokukhawuleza ukuguga kweeradicals zamahhala. I-Cysteine ????inokuguqulwa kwi-methionine emzimbeni, kwaye le nkqubo idinga ukubandakanyeka kwe-vitamin B6. Okwangoku, xa ithathwa kunye ne-selenium kunye ne-vitamin E, i-cysteine ????inokusebenzisa ukusebenza kwayo okuphezulu. Ukongezelela, i-cysteine ????iqulethe inani eliphezulu lesulfure, elinceda ukuphelisa izinto ezinobuthi ukukhusela iiseli.