Research Comparison
IGF-1 LR3 vs Tesamorelin
A side-by-side research comparison of IGF-1 LR3 and Tesamorelin drawn from DRPSHP' peptide database records.
IGF-1 LR3
IGF-1 LR3 is insulin-like growth factor 1 altered in two ways, and the name is a record of both: L for the long N-terminal extension of 13 amino acids added to native IGF-1's 70, giving 83 residues in total, and R3 for arginine replacing glutamate at position 3. Together these changes reduce its affinity for the IGF-binding proteins that normally hold most IGF-1 in bound complexes. It is made by recombinant methods and is best known as a supplement in serum-free media for growing mammalian cell lines. Beyond cell culture the published work is chiefly animal studies, with very limited human data.
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.