What is the Body's Master Antioxidant? Glutathione and Vitamin C: Do They Work Together? Life Extension 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 Benefits for Gut Health Nikki Yelton RD Foods With L Glutathione: Avocado, Watermelon, and More GoodRx