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 Increasing glutathione levels by a novel posttranslational mechanism inhibits neuronal hyperexcitability ScienceDirect Good for You Glutathione Repchage