Comparison

Sermorelin vs Tesamorelin

Function

While Sermorelin is used as a diagnostic agent for assessing GH secretory capacity and as a research tool or off-label therapy to increase endogenous GH in GH-deficient or age-related contexts1727, 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 Sermorelin works as a synthetic 29-amino-acid peptide identical to the 1–29 N-terminal fragment of human GHRH that stimulates GH synthesis and secretion by binding pituitary GHRH receptors1727120, 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

Sermorelin is 29 amino acids long, whereas Tesamorelin is longer as it has a length of 44 amino acids. Sermorelin 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. 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

Sermorelin

Growth hormone–releasing hormone receptor (GHRHR) on pituitary somatotrophs94103120

Tesamorelin

Growth hormone–releasing hormone receptor (GHRHR) 9394103

Organism or Origin

Sermorelin

Synthetic peptide corresponding to human hypothalamic GHRH(1–29) 17120

Tesamorelin

Synthetic analog of human hypothalamic GHRH1893

Gene

Sermorelin

GHRH

Tesamorelin

GHRH

Related articles

No related articles are linked to these peptides yet.

Sources

17Sermorelin - Wikipedia, https://en.wikipedia.org/wiki/Sermorelin
27Sermorelin, https://pubchem.ncbi.nlm.nih.gov/compound/Sermorelin
94Growth-hormone-releasing hormone receptor - Wikipedia, https://en.wikipedia.org/wiki/Growth-hormone-releasing_hormone_receptor
103Growth-hormone-releasing hormone receptor - Wikipedia, https://en.wikipedia.org/wiki/Growth_hormone_releasing_hormone_receptor
120Growth hormone–releasing hormone - Wikipedia, https://en.wikipedia.org/wiki/Growth_hormone%E2%80%93releasing_hormone
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