Glutathione Glutathione is the most abundant natural antioxidant in our bodies and is a critical regulator of oxidative stress and immune function. Over 80 000 published studies have shown that glutathione plays a Glutathione Reduced 500 mg of Vital Antioxidant Dr. Clark Store When it comes to glutathione, purity = performance That's why Glutone 1000 uses Setria L Glutathione, crafted in Japan through a patented bio fermentation process. What makes Setria special? 99.5% purity L Glutathione (Reduced), 500 mg, 120 Veggie Capsules