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 Alpha Lipoic Acid IV Therapy for Liver Diseases and Diabetes Is glutathione safe? Targeting Aldose Reductase for the Treatment of Diabetes Complications and Inflammatory Diseases: New Insights and Future Directions Journal of Medicinal Chemistry