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 Glutathione Index Defines How Your Cells Are Ageing Glutathione Wikipedia Sulforaphane rewires central metabolism to support antioxidant response and achieve glucose homeostasis ScienceDirect Glutathione for Food and Health Applications with Emphasis on Extraction, Identification, and Quantification Methods: A Review