Zinc is one of the most important nutrients for your thyroid because it impacts your thyroid in so many ways. Zinc supplements help your thyroid by influencing T4 to T3 conversion, by improving your immune system, and by lowering thyroid inflammation. If you are zinc deficient you may experience the symptoms of hypothyroidism. Even patients with Hashimoto's can benefit from zinc supplementation provided they take the right dose. Learn more about the best zinc forms for thyroid problems.