Ọkwa nri L-Cysteine bụ ihe mgbakwunye nri amino acid bara uru nke a na-ejikarị na nri anụmanụ.Ọ na-arụ ọrụ dị oke mkpa na njikọ protein ma na-akwado uto na mmepe n'ozuzu anụmanụ.L-Cysteine na-ejekwa ozi dị ka ihe mmalite maka mmepụta nke antioxidants, dị ka glutathione, nke na-enyere ụmụ anụmanụ aka ịgbachitere nrụgide oxidative.Na mgbakwunye, L-Cysteine mara ka ọ na-akwalite ojiji nke nri ndị dị mkpa, na-ebuli ihe mgbochi, na ịkwado ahụike eriri afọ.Mgbe ejiri ya dị ka akụkụ nke nri kwesịrị ekwesị, ọkwa L-Cysteine na-enye aka na ịdịmma na arụmọrụ nke anụmanụ niile.