Although the antioxidant glutathione is linked to cancer, this new research you should stop eating antioxidant rich whole foods. Eating a balanced diet with fruits and vegetables is important. It Glutathione: Master Antioxidant, Reducing Oxidative Stress, and Detoxification What Is Glutathione? 8 Health Benefits That Might Surprise You Glutathione is the body's primary internal antioxidant, made using the amino acid cysteine, and it helps protect cells from oxidative stress. Beyond detoxification, research shows glutathione is involved in thyroid hormone metabolism, Amazon.com: NOW Foods Supplements, Glutathione 500 mg, With Milk Thistle Extract & Alpha Lipoic Acid, Free Radical Neutralizer*, 60 Veg Capsules : Health & Household