N acetylcysteine supplementation increases exercise performance and reduces oxidative stress only in individuals with low levels of glutathione ScienceDirect Glutathione vs Astaxanthin: Which Is Better? Performance Lab Combined vitamin C and glutathione supplement may enhance sporting performance 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