Dietary Supplement. Supports Thyroid, Immune & Complete Metabolic Function*. Iodine With L-Tyrosine. Clinically Studied Ingredients. Unconditionally Guaranteed Thyroid Care™ provides superior nutritional support for healthy thyroid & immune function. Optimal levels of iodine benefit the thyroid gland & enhance metabolism. L-Tyrosine plays an important role in the production of thyroid hormones. L-Thyrosine is an important amino acid which is absolutely necessary for the body to produce thyroid hormones. It is impossible to have a well functioning thyroid without sufficient quantities of tyrosine combined with iodine, e.