Because glutathione levels decline as you age, and glycine can help slow the glutathione slide, it's a good idea to keep your levels high by eating protein rich foods, like organic poultry, grass fed Evaluation of Glutathione, Albumin and Ascorbic Acid Levels in Breast Cancer Patients Glutathione: Master Antioxidant, Reducing Oxidative Stress, and Detoxification A study shows that the antioxidant glutathione feeds cancer cells Glutathione Depletion and Stalwart Anticancer Activity of Metallotherapeutics Inducing Programmed Cell Death: Opening a New Window for Cancer Therapy ACS Omega