GHRP-2 Peptide 5mg

GHRP-2 (Pralmorelin) is a synthetic hexapeptide studied in laboratory research for its interaction with the growth hormone secretagogue receptor (GHS-R), the same receptor activated by the endogenous hormone ghrelin. This product is studied in vitro and is not intended for human or veterinary use.

Peptide Structure and the D-2-Naphthylalanine Substitution

GHRP-2's structure is closely related to GHRP-6, sharing the same D-Ala and D-Phe framework but substituting D-2-naphthylalanine (D-2-Nal) at the position occupied by D-tryptophan in GHRP-6. This substitution is of interest in structure-activity research because the bulkier naphthyl side chain is thought to improve hydrophobic contacts within the receptor's binding pocket relative to the indole ring of tryptophan.

This structural distinction is a frequent reference point in laboratory literature discussing binding characteristics across the GHRP-class secretagogues.

Comparative Structural Context Among GHRP-Class Secretagogues

GHRP-2 is one of several hexapeptide secretagogues sharing a related backbone, alongside GHRP-6 and hexarelin, that differ from one another primarily through substitutions at one or two positions in an otherwise conserved sequence.

• GHRP-6 uses D-tryptophan at the position where GHRP-2 uses D-2-naphthylalanine
• Hexarelin uses a methylated D-tryptophan variant at the same position

Researchers comparing these structurally similar peptides have focused on how such localized substitutions, rather than differences in peptide length or backbone chemistry, can meaningfully alter receptor engagement, illustrating a broader principle in short-peptide structure-activity research.

Receptor-Binding Assay Design in Cell-Based Systems

Laboratory research on GHS-R-targeting peptides such as GHRP-2 commonly relies on cell lines engineered to express the receptor of interest, allowing researchers to measure ligand binding and downstream signaling within a controlled cell culture system.

This approach isolates a single receptor's response from the many other signaling pathways present in a whole organism, and is a standard methodology for characterizing new GHS-R ligands at the cellular level.

Analytical Purity Verification

GHRP-2's bulky D-2-naphthylalanine residue introduces a specific synthesis risk that purity testing needs to account for: incomplete coupling at this bicyclic side chain during solid-phase synthesis.

Combined HPLC and mass spectrometry verification is used to detect this potential byproduct alongside standard sequence confirmation.

A certificate of analysis reporting purity consistent with the stated specification is generally regarded as the appropriate baseline for laboratory experiments requiring consistent receptor-binding behavior across replicate assays.

Storage and Handling in the Laboratory Setting

Lyophilized GHRP-2 is stored under sub-zero freezer conditions to preserve integrity between experimental sessions, with the powder kept away from prolonged light exposure, consistent with standard handling practices for aromatic-residue-containing research peptides.

Important Notice

GHRP-2 is provided strictly for laboratory research use only (in vitro) and is not approved for human or veterinary use. Any application outside of controlled research environments is strictly prohibited, and these findings do not establish safety, efficacy, or suitability for any human application.

Product Information

GHRP-2 is supplied as a lyophilized powder (5 mg per vial) exclusively for in vitro research use.