Pure Encapsulations NAC 900mg 120 CapsulesNAC 900mg Powerful free radical defense N Acetyl L Cysteine (NAC) is a derivative of the nutritional amino acid l cysteine. NAC scavenges free radicals and decreases oxidative stress produced by heavy metals to promote antioxidant defence. It is also a precursor to the antioxidant glutathione, and supplemental NAC increases tissue levels of glutathione. Several animal studies suggest that NAC administration may also assist in moderating the effects of