This gland makes its hormones by combining iodine with the amino acid tyrosine
It causes resorption of thyroid colloid and increases the rates of both 
glucose .... As with other polypeptide hormones, extensive variation in amino-
acid... [DOC] [TLE] L Tyrosine and Thyroid Function - ProgressiveHealth.com [PAR] L-Tyrosine is a natural amino acid that can be used to improve hypothyroid 
problems.