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 Oxidative stress in Hashimoto's thyroiditis: possible adjuvant therapies to attenuate deleterious effects Molecular and Cellular Biochemistry Springer Nature Link The Influence of Oxidative Stress on Thyroid Diseases How to Increase Glutathione to Protect Against Hashimoto's