Growth Hormone Release Studies Tesamorelin is a synthetic version of growth hormone releasing hormone, or GHRH. The sequence matches the full 44 amino acid human hormone. A chemical group added to one end protects it from an enzyme called DPP-4, which would otherwise break it down quickly. Research has measured growth hormone output and how fat tissue is distributed in study models. Formula: C221H366N72O67S Mol. weight: 5135.89 Da Length: 44 residues CAS: 218949-48-5