GHRP-2
Lab-Tested ≥98% Purity · Certificate of Analysis Included · Global Shipping
GHRP-2 — Growth Hormone Releasing Hexapeptide for Endocrine Research
GHRP-2 (Growth Hormone Releasing Peptide 2), also designated as Pralmorelin, is a synthetic hexapeptide (D-Ala-D-2Nal-Ala-Trp-D-Phe-Lys-NH₂) that acts as a potent agonist of the growth hormone secretagogue receptor (GHS-R1a), commonly known as the ghrelin receptor. Developed through systematic structure-activity relationship studies by Bowers et al. in the early 1990s, GHRP-2 is considered one of the most potent members of the GHRP family and serves as a critical pharmacological tool for investigating the somatotropic axis, ghrelin receptor biology, and pulsatile growth hormone secretion patterns.
Mechanism of Action
GHRP-2 binds to the GHS-R1a receptor on somatotroph cells of the anterior pituitary, activating phospholipase C through Gq/11 signaling and triggering IP3-mediated calcium release from intracellular stores. This calcium mobilization stimulates the exocytosis of GH-containing secretory vesicles. Published research in Endocrine Reviews (1999) demonstrated that GHRP-2 acts synergistically with GHRH by recruiting additional somatotrophs and amplifying the secretory burst amplitude. Notably, GHRP-2 also suppresses somatostatin release from hypothalamic neurons, further disinhibiting GH secretion through a complementary mechanism.
Key Research Areas
- Growth Hormone Secretion: GHRP-2 is among the most potent GH secretagogues characterized, producing dose-dependent GH release with peak plasma concentrations within 15-30 minutes. Comparative studies have shown GHRP-2 elicits greater GH responses than GHRP-6 at equivalent doses, making it an ideal tool for studying somatotroph function.
- GHS Receptor Pharmacology: As a high-affinity GHS-R1a agonist, GHRP-2 has been instrumental in characterizing receptor desensitization kinetics, internalization dynamics, and the biased agonism that differentiates synthetic GHS ligands from endogenous ghrelin signaling.
- Appetite and Metabolic Regulation: Through its action on GHS-R1a receptors expressed in the arcuate nucleus, GHRP-2 influences NPY/AgRP neuronal populations and modulates feeding behavior in rodent models, providing insights into the orexigenic pathways linking GH secretagogue signaling to energy homeostasis.
- Pituitary Reserve Testing: Researchers have utilized GHRP-2 as a diagnostic challenge agent in clinical studies published in European Journal of Endocrinology to evaluate GH secretory capacity and distinguish between hypothalamic and pituitary causes of GH deficiency.
Why Researchers Choose Peptides BioLab
Every batch of GHRP-2 supplied by Peptides BioLab undergoes rigorous HPLC and mass spectrometry analysis, ensuring ≥98% purity verified by an independent Certificate of Analysis (CoA). Our GHRP-2 is supplied as a lyophilized powder for maximum stability and shelf life, shipped worldwide from our state-of-the-art facilities in temperature-controlled packaging.
Related Research Peptides
Researchers studying GH secretagogue receptor biology may also find these compounds relevant: GHRP-6, Ipamorelin, and CJC-1295 No DAC. For a complete overview, browse our Growth Hormone Research collection.
For research purposes only — Not for human consumption. All products are intended solely for in-vitro research and laboratory use.
Every Peptides BioLab product includes a Certificate of Analysis (CoA) with HPLC and MS data confirming ≥98% purity. The CoA is available in the product tabs as the 2nd image, or contact our team to request a copy.
Shipping: We ship worldwide from our state-of-the-art facilities. Orders are processed within 1–2 business days. Express and standard shipping options available at checkout.
Storage: Store lyophilized peptides at -20°C for long-term storage. Once reconstituted, store at 2–8°C and use within 30 days. Keep away from direct sunlight.
