Meet Rats army- one of the best online platforms to buy n-acetyl-cysteine. Acetylcysteine is the N-acetyl derivative of the amino acid L-cysteine and is a precursor in the formation of the antioxidant glutathione in the body. The thiol (sulfhydryl) group confers antioxidant effects and is able to reduce free radicals. N-acetyl cysteine (NAC) is frequently utilized where intracellular oxidant-antioxidant balance is concerned. NAC has a protective effect against liver injury in rats . One study has reported improvement of liver histopathology and reduction of oxidative stress by NAC in non-alcoholic fatty steatosis (NASH) in a rat model .