Does the use of cysteine rich whey protein supplements (Inmunocal) improve the health well being of COVID 19 patients? A quali 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 Health Tip on Glutathione Can Boost Immune System Immunocal Sport: Patented Glutathione Precursor Immunotec Immunotec