Research Comparison
Ipamorelin vs Tesamorelin
A side-by-side research comparison of Ipamorelin and Tesamorelin drawn from DRPSHP' peptide database records.
Ipamorelin
What made Ipamorelin interesting in its original animal pharmacology was what it did not do. Older growth hormone-releasing peptides raised ACTH and cortisol alongside growth hormone; in those studies this one did not, and that selectivity is the reason it is still discussed. It is a synthetic pentapeptide, Aib-His-D-2-Nal-D-Phe-Lys-NH2, derived from the earlier compounds in the class and a residue shorter than both GHRP-2 and GHRP-6, acting as an agonist at the ghrelin receptor GHS-R1a. Because that receptor also sits in the gut, rodent models of gastrointestinal motility have used it as well. A small number of human clinical studies exist; the bulk of what is known is animal work, and human data remain limited.
Tesamorelin
Native growth hormone-releasing hormone is inactivated by dipeptidyl peptidase-4 within minutes, and Tesamorelin is an attempt to solve that specific problem. It keeps all 44 residues of human GHRH and modifies the N-terminus, attaching a trans-3-hexenoyl group to the first residue, tyrosine, a change reported to shield the peptide from that enzyme. It is a different approach from sermorelin, which truncates the hormone to its first 29 residues and carries no protecting group at all. Human clinical research has concentrated on HIV-associated lipodystrophy, a disorder of fat distribution, with smaller studies elsewhere; animal and cell work on the growth hormone axis sits alongside it. Outside the lipodystrophy setting, human data are limited.
Reading a comparison
A comparison places two records side by side; it does not merge them. Each description above is drawn from that compound's own record, and the two were not necessarily characterised by the same methods, at the same time, or to the same level of detail. Before comparing any attribute, it is worth establishing that both records describe the substance you think they describe — names are not identifiers, and two entries sharing a name can differ in salt form, stereochemistry or the convention used to state a mass. Where a figure carries no method beside it, the comparison is between two reported numbers rather than between two measurements.