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Growth-Factor Research · Secretagogue Class

Hexarelin: Research Overview

What is hexarelin? Hexarelin is a synthetic hexapeptide — a chain of six amino acids — that acts as an agonist of the ghrelin receptor (GHS-R). It is studied in growth-hormone-secretagogue receptor pharmacology and has a distinct preclinical literature in cardiac models. It is sold strictly for laboratory research use.
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Technical profile

CompoundHexarelin
ClassSynthetic hexapeptide (6 amino acids); ghrelin-receptor (GHS-R) agonist
Molecular weight~887.0 g/mol
Receptor targetGhrelin receptor (GHS-R)
Form suppliedLyophilized powder, sealed vial
StorageLyophilized: 2–8 °C, protected from light.
VerificationHPLC purity ≥99%, sterility, endotoxins, heavy metals — documented on the batch COA

What does the research literature cover?

Hexarelin belongs to the earlier generation of synthetic peptide secretagogues and has been characterized extensively in preclinical models. Published work has examined it in the context of:

Important context: the published evidence base is preclinical (cell and animal models). Hexarelin has no approved human use in any jurisdiction. Summaries here describe what researchers have studied — they are not claims about effects in humans.

Why purity matters for hexarelin research

Receptor-pharmacology results are only as reliable as the material in the vial. Truncated sequences, deletion impurities, or endotoxin contamination confound binding and functional assays. Every VP Peptides hexarelin batch ships with a Certificate of Analysis documenting ≥99% HPLC purity, sterility, endotoxin and heavy-metal testing from independent third-party testing.

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Frequently asked questions

Is hexarelin approved for human use?

No. Hexarelin is not approved by the FDA or any other regulatory agency for human use. It is supplied strictly as a research chemical for in-vitro and laboratory investigation. It is not a drug, supplement, or food ingredient.

How does hexarelin differ from other secretagogues in the literature?

Hexarelin is a six-amino-acid peptide from the earlier generation of synthetic GHS-R agonists. Compared with the more selective pentapeptide ipamorelin, it is a potent but less selective agonist, and it carries a distinct preclinical literature in cardiac models that other secretagogue-class compounds do not share.

How should hexarelin be stored in the lab?

Lyophilized vials should be kept at 2–8 °C and protected from light.

What is hexarelin's status in competitive sport?

Growth-hormone secretagogues, including hexarelin, are listed as prohibited substances under the World Anti-Doping Agency (WADA) Prohibited List. This is noted for informational purposes only; VP Peptides materials are supplied solely for laboratory research.

The receptor mechanism and the cardiac preclinical literature

Hexarelin is a synthetic hexapeptide agonist of the growth-hormone-secretagogue receptor (GHS-R1a), the same G-protein-coupled receptor that the natural peptide ghrelin activates. Engaging GHS-R1a on pituitary somatotrophs triggers Gq/phospholipase-C signaling and a rise in intracellular calcium — the classical secretagogue pathway characterized for this compound class. As one of the earlier synthetic secretagogues, hexarelin appears frequently in the literature as a potent reference agonist against which newer, more selective peptides are compared.

What sets hexarelin apart in the published record is a sustained line of preclinical cardiac research. Investigators identified specific binding sites for growth-hormone-releasing peptides in myocardial tissue, and later work attributed part of hexarelin's cardiac binding to the scavenger receptor CD36 alongside GHS-R1a. In rodent models, Tivesten and colleagues examined hexarelin in the setting of experimental myocardial infarction, and Pettersson and colleagues reported that hexarelin, like ghrelin, stimulated proliferation of cultured H9c2 cardiomyocytes. More recently, Huang and colleagues studied hexarelin in a rat ischemia/reperfusion model and linked the observations to interleukin-1 signaling.

A key point of interpretation: several of these reports describe cardiac actions that appear at least partly independent of growth-hormone release, which is why the compound is studied as a receptor-pharmacology tool and not solely as a GH secretagogue. All of this work is preclinical — conducted in isolated cells and animal models. Hexarelin has no approved human use in any jurisdiction, and the summaries here report what has been observed in laboratory systems, not effects of the research material in people.

Selected research references

Related research compounds

Research use only. All products described on this page are furnished for laboratory research purposes only and are not for human or veterinary use, not for use in food or cosmetics, and not for any diagnostic or therapeutic application. Nothing on this page is medical advice or a claim of safety or efficacy in humans. Research summaries reference publicly available preclinical literature; specific citations are listed in the references above.