What Happens to Your Body When You Eat Onions Every Day Flavonoids increase the intracellular glutathione level by transactivation of the glutamylcysteine synthetase catalytical subunit promoter ScienceDirect 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, Uses and Best Practices Olympia Pharmacy