I-Cysteine ????ingenye yezingxenye ze-glutathione, ezingasheshisa ukuguga kwama-radicals mahhala. I-Cysteine ????ingaguqulwa isuka ku-methionine emzimbeni, futhi le nqubo idinga ukubandakanyeka kwe-vitamin B6. Phakathi naleso sikhathi, uma ithathwa kanye ne-selenium ne-vitamin E, i-cysteine ????ingakwazi ukusebenzisa ukusebenza kwayo okuphezulu. Ngaphezu kwalokho, i-cysteine ????iqukethe inani elikhulu lesulfure, esiza ukuqeda izinto ezinobuthi ukuvikela amangqamuzana.