Foods rich in glutathion (antioxidant) Which foods are highest in glutathione ? Glutathione is one of the most powerful antioxidants, naturally synthesized in the body and central to cellular defense. Glutathione supports the effective functioning of the immune system by reducing oxidative damage caused 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 What are the Natural Sources of Glutathione?