Frontiers Selenium and thyroid diseases This one antioxidant is ULTRA important for your thyroid function Glutathione is our body's master antioxidant meaning it's the most important and abundant one. As it relates to the thyroid, think Raised plasma glutathione S transferase values in hyperthyroidism and in hypothyroid patients receiving thyroxine replacement The BMJ Hashimoto's vs. Hypothyroidism: Understand the Difference the biostation