L Glutathione Reduced (GSH), Food Grade Antioxidant, EP6 Fingredients Top 10 Foods High In Glutamine Food & Drink Holland & Barrett Glutathione is such an important antioxidant in human physiology, meaning it acts to combat oxidative stress. Strategies for increasing glutathione include: Consume sulfur rich foods like cruciferous vegetables Ensure you get Glutathione in Food: How Your Diet Supports This Antioxidant