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 The Master Antioxidant: Why Glutathione is Essential for You by Professor Roberto Grobman Medium Frontiers Systematic Understanding of Pathophysiological Mechanisms of Oxidative Stress Related ConditionsDiabetes Mellitus, Cardiovascular Diseases, and IschemiaReperfusion Injury Endogenous Deficiency of Glutathione as the Most Likely Cause of Serious Manifestations and Death in COVID 19 Patients Glutathione deficiency and heart failure: a systematic review of human and animal evidence ScienceDirect