What Thyroid Supplements Do Reactivate Your Thyroid: Underactive thyroid has been linked to brain fog, lethargy, and more. Helps maintain the normal function of a healthy thyroid. Improve Blood Flow: In addition to minerals like zinc, copper, magnesium, manganese, and selenium, which are known to aid in thyroid formation, this helps deliver these nutrients to all parts of your body. Made to Strict Standards: Our non-GMO capsules are made in the U.S. in a CGMP-certified facility using globally sourced ingredients, so you can rest assured that every bottle of capsules is exactly what it says on the label.