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 Your Complete Guide to Glutathione Schoenwalder Health & Wellness 8 Foods Containing the Highest Quantity of Glutathione Glutathione Foods: 10 Natural Ways To Increase Glutathione Level Plix Glutathione in Food: How Your Diet Supports This Antioxidant