Dr. Jill Health® Thyroid Boost is a comprehensive formulation that provides a blend of nutrients and botanicals working in synergy to support thyroid health. Dr. Jill Health® Thyroid Boost includes L-tyrosine and iodine, which make up the backbone of the thyroid hormones thyroxine (T4) and triiodothyronine (T3). The addition of zinc, selenium, vitamin A, and the botanical guggulipid activate enzymes that enhance the conversion of T4 into the active thyroid hormone T3. Vitamin A and zinc also help improve cellular sensitivity to thyroid hormones. Turmeric (The Complete Turmeric Matrix), along with the antioxidants vitamin C and E and N-acetyl cysteine (NAC), provide a powerful combination of antioxidants that boost thyroid health by reducing free radical stress.