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 Frontiers Glutathione: A Samsonian life sustaining small molecule that protects against oxidative stress, ageing and damaging inflammation S Acetyl Glutathione Emothion Supplement Antioxidant & Detox Support HormoneSynergy Glycine Ingredient Guide Time Health