Strong Nature THYROID FORMULA is a dietary supplement based on the amino acid l-tyrosine, vitamin E, selenium and iodine, which contributes to the proper functioning of the thyroid gland. L-tyrosine is a conditionally essential amino acid necessary for the synthesis of thyroid hormones. Given that it is formed from the essential amino acid phenylalanine, the lack of this acid in the food we eat can also lead to a decrease in l-tyrosine in the body.
