This one antioxidant is ULTRA important for your thyroid function , Glutathione is our bodys master antioxidant meaning its the most important and abundant one. As it relates to the thyroid, Oxidative stress in Hashimoto's thyroiditis: possible adjuvant therapies to attenuate deleterious effects Molecular and Cellular Biochemistry Springer Nature Link 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, 9 Health Benefits of Glutathione Apoptosis and glutathione: beyond an antioxidant Cell Death & Differentiation Glutathione for Hashimoto's Dr Josh Redd