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, 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, Full article: An increase of oxidative stress markers and the alteration of the antioxidant enzymatic system are associated with spleen damage caused by methimazole induced hypothyroidism Role of Glutathione in Cancer: From Mechanisms to Therapies