Gamma Glutamyl Glutathione an overview ScienceDirect Topics Onions contain vitamin C and B 6 which are important for the production of glutathione, a sulphur containing protein that acts as an antioxidant for the lens of the eye. Raising glutathione levels 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