Thyroid Formula is a supplement with minerals, amino acids, and vitamins that is used to maintain the health of the thyroid gland. Selenium helps protect the thyroid from oxidative damage and plays an essential role in the production of thyroid hormones. Iodine is a component of thyroid hormones and provides energy in the body. L-Tyrosine is an important amino acid in the production of enzymes and thyroid hormones. Vitamin E has antioxidant properties.