What is glutathione and why must we protect patient access to it? Reduced Glutathione Antioxidant Immune Support & Cellular Health 500 MG (60 Capsules) Macy's 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 L Glutathione vs. oxidized vs. Reduced Glutathione