NAC [N AcetylCysteine] is a precursor of Glutathione. PICTURE: Glutathione is made from three amino acids and cysteine is one of them N Acetyl Cysteine (Glutathione Precursor) JCI Insight NAD+ precursors prolong survival and improve cardiac phenotypes in a mouse model of Friedreich's Ataxia Opt1 imports CoA precursors as glutathione mixed disulfides Jouke Wedman 10 comments Every time you exercise your body generates oxidative stress as a natural byproduct of muscle contraction and energy production. At moderate levels that is a healthy signal. But when exercise intensity exceeds