Understanding NAC: A Small Supplement With Big Benefits One of the supplements I take daily is NAC (N Acetyl Cysteine)a supplement form of cysteine, a conditionally essential amino acid. Amino acids like Individuals with MTHFR mutations and slow COMT activity can generally take N acetylcysteine (NAC) and glutathione, but there are some important considerations: ## N Acetylcysteine (NAC) * **Benefits**: NAC supports the production of glutathione, NAC vs Glutathione: Comparing Antioxidant Powerhouses for Your Health IVDrips Glutathione Getting the k'NAC'k of Parkinson's disease The Science of Parkinson's