L-Cysteine ndechimwe chemakumi maviri echisikigo amino acids uye, kunze kwemethionine, iyo chete ine sarufa.Iyo thiol-ine isiri-yakakosha amino acid iyo yakashongedzwa kuti iite Cystine.Iyo isiri-yakakosha sarufa-ine amino acid muvanhu, ine hukama necystine, Cysteine yakakosha kune mapuroteni synthesis, detoxification, uye akasiyana metabolic mabasa.Inowanikwa mu beta-keratin, puroteni huru muzvipikiri, ganda, uye vhudzi, Cysteine yakakosha mukugadzirwa kwe collagen, pamwe nekuwanda kweganda uye kugadzirwa.