Comparison

Selank vs Tesamorelin

Function

While Selank is a peptide developed in Russia as an anxiolytic and nootropic; in animal models it reduces anxiety-like behavior and modulates immune parameters under stress39, Tesamorelin is FDA-approved to reduce excess visceral adipose tissue in HIV-associated lipodystrophy and is studied for broader body-composition, NAFLD, and cognitive effects via GH/IGF-1 axis modulation1893.

Mechanism

While Selank works as a synthetic heptapeptide, Thr-Lys-Pro-Arg-Pro-Gly-Pro, that combines a tuftsin fragment with a Pro-Gly-Pro motif and is reported to modulate GABAergic neurotransmission and cytokine balance while being resistant to proteolytic degradation39, Tesamorelin is a full-length 44-amino-acid GHRH analog with an N-terminal trans-3-hexenoic acid modification that binds GHRHR, activating cAMP/PKA signaling to increase endogenous GH and IGF-1, with improved stability versus native GHRH182893102.

Length and Sequence

Selank is 7 amino acids long, whereas Tesamorelin is longer as it has a length of 44 amino acids. Selank is made up of a sequence of Threonine, Lysine, Proline, Arginine, Proline, Glycine, Proline. Tesamorelin is made up of a sequence of Tyrosine, Alanine, Aspartic acid, Alanine, Isoleucine, Phenylalanine, Threonine, Asparagine, Serine, Tyrosine, Arginine, Lysine, Valine, Leucine, Glycine, Glutamine, Leucine, Serine, Alanine, Arginine, Lysine, Leucine, Leucine, Glutamine, Aspartic acid, Isoleucine, Methionine, Serine, Arginine, Glutamine, Glutamine, Glycine, Glutamic acid, Serine, Asparagine, Glutamine, Glutamic acid, Arginine, Glycine, Alanine, Arginine, Alanine, Arginine, Leucine.

Receptor

Selank

Not clearly established in the current dataset.

Tesamorelin

Growth hormone–releasing hormone receptor (GHRHR) 9394103

Organism or Origin

Selank

Synthetic analog of the IgG-derived tetrapeptide tuftsin39

Tesamorelin

Synthetic analog of human hypothalamic GHRH1893

Gene

Selank

Not assigned in the current dataset.

Tesamorelin

GHRH

Related articles

No related articles are linked to these peptides yet.

Sources

39Application of thr-lys-pro-arg-pro-gly-pro peptide (selank) for ..., https://patents.google.com/patent/RU2629832C1/en
18Tesamorelin: Benefits, Dosing & Where to Buy (2026) - Peptides, https://thepeptidecatalog.com/peptides/tesamorelin
28The Ultimate Guide to Tesamorelin | Las Vegas | Sky Health, https://www.skyhealthnv.com/tesamorelin
93Tesamorelin - FDA-Approved GHRH Analog Guide - PeptideMark, https://www.peptidemark.com/peptides/tesamorelin
94Growth-hormone-releasing hormone receptor - Wikipedia, https://en.wikipedia.org/wiki/Growth-hormone-releasing_hormone_receptor
102Tesamorelin: Molecular Characterization and Metabolic Research, https://biotechpeptides.com/2026/03/25/tesamorelin-molecular-characterization-growth-hormone-axis-modulation-and-metabolic-research/
103Growth-hormone-releasing hormone receptor - Wikipedia, https://en.wikipedia.org/wiki/Growth_hormone_releasing_hormone_receptor