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 L Glutathione Complex 30 Vegan Capsules G&G Vitamins Glutathione, the Underrated Antioxidant You Need in Your Diet Glutathione Benefits: Top Uses for Your Health Nutrisense Journal