N Acetyl L Cysteine, or NAC, is the acetylated form of the amino acid L Cysteine. It possesses strong antioxidant properties due to the presence of a thiol group ( SH). This form of cysteine is The three unique antioxidants in Gx Media, Acetyl L Carnitine, Alpha Lipoic Acid and N Acetyl L Cysteine, have a highly beneficial effect on embryo development when used individually and to an even L Cysteine VS N Acetyl L Cysteine Neuroprotective Effects of N Acetyl Cysteine and Acetyl L Carnitine after Spinal Cord Injury in Adult Rats PLOS One