A Comprehensive Review of Selenium as a Key Regulator in Thyroid Health Biological Trace Element Research Springer Nature Link Hypothyroidism (underactive thyroid) is more common in people with Down syndrome. About 40% of the adolescents and adults with Down syndrome we have seen at our clinic have hypothyroidism. One of the Drug delivery systems for thyroid disease treatment: A mini review on current therapies and alternative approaches ScienceDirect 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 Frontiers Selenium and thyroid diseases