Glutathione metabolism in cancer progression and treatment resistance Journal of Cell Biology Rockefeller University Press 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 Glutathione and Thioredoxin Antioxidant Pathways Synergize to Drive Cancer Initiation and Progression: Cancer Cell Glutathione Peroxidase: An Antioxidant Enzyme In Health And Disease Diet and Supplements in Cancer Prevention