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 The Best Strategies for Reducing Thyroid Traditional Chinese Medicine for Hashimoto's Thyroiditis: Focus on Selenium and Antioxidant Phytochemicals Methimazole induced hypothyroidism causes alteration of the REDOX environment, oxidative stress, and hepatic damage; events not caused by hypothyroidism itself Annals of Hepatology