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 GlyNAC (Glycine and N Acetylcysteine) Supplementation in Old Mice Improves Brain Glutathione Deficiency, Oxidative Stress, Glucose Uptake, Mitochondrial Dysfunction, Genomic Damage, Inflammation and Neurotrophic Factors to Reverse Age Associated Glutathione Benefits: Top Uses for Your Health Nutrisense Journal Do You Have a Glutathione Deficiency? Glutathione Participation in the Prevention of Cardiovascular Diseases Glutathione Benefits for Gut Health Nikki Yelton RD