N acetylcysteine: what benefits does it offer? What is its link with glutathione? Supplementation with a combination of glycine and N acetylcysteine (precursors to glutathione) improved glutathione levels, oxidative stress, mitochondrial function, muscle strength, exercise capacity, cognition in older individuals. The supplement Antioxidant Precursor Molecule Could Improve Parkinson's Differential effects of N acetylcysteine on retinal degeneration in two mouse models of normal tension glaucoma Cell Death & Disease Is N Acetylcysteine (NAC) Effective as Psychiatric and Neurological Treatment? Where Does the Evidence Lie?