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 Intranasal Delivery of Metabolically Resilient Glutathione: In Vivo Pharmacokinetic, Permeation, and Efficacy Studies Molecular Pharmaceutics I get anxiety when taking nac glycine. Can this one do the same job and is it good when you are supersensitive and reacting to everything? Glutathione Depletion and Stalwart Anticancer Activity of Metallotherapeutics Inducing Programmed Cell Death: Opening a New Window for Cancer Therapy ACS Omega