Ipamorelin

Ipamorelin - Selective Growth Hormone Releasing Peptide

Ipamorelin is a pentapeptide GHRP (Growth Hormone Releasing Peptide) first described in 1998 as the first truly selective GH secretagogue. It activates the ghrelin receptor (GHS-R1a) to trigger a short, clean pulse of growth hormone release from the pituitary - but unlike earlier GHRPs (GHRP-2, GHRP-6, hexarelin), it does this with minimal cortisol, prolactin, or ACTH cross-activation. That selectivity is why it has become the default GHRP pairing partner in GHRH + GHRP pulsatility research.

Why Ipamorelin’s Selectivity Matters

Earlier GHRPs triggered GH release but also stimulated adjacent pathways - cortisol release, prolactin elevation, and hunger signaling via ghrelin overflow. Ipamorelin’s structural design keeps the ghrelin-receptor agonism without most of the cross-activation. That makes it the cleanest tool for studies that want to isolate the GH-pulse effect of GHRP signaling.

Ipamorelin vs Other GHRPs vs GHRH Peptides

Most GH-axis research separates peptides into GHRPs (amplify the pulse) and GHRH analogs (initiate the pulse). Ipamorelin sits in the GHRP column alongside GHRP-2 and GHRP-6; Sermorelin, Tesamorelin, and CJC-1295 sit in the GHRH column.

Researchers pair Ipamorelin with a GHRH analog (most commonly CJC-1295 No DAC, available from WWP as a single-vial CJC/Ipa blend) because the two pathways amplify each other.

Research Applications

Ipamorelin is used in studies examining:

• Pulsatile GH release characterization
• GHRH + GHRP combination research (most commonly with CJC-1295 No DAC)
• IGF-1 downstream response curves
• Body composition and recovery endpoints under GH-axis stimulation
• Comparative selectivity vs. non-selective GHRPs (GHRP-2, GHRP-6)
• Sleep and nocturnal GH-pulse alignment

Specifications

Storage & Handling

Unopened vials are kept at 2-8°C under standard cold-chain conditions and remain stable for 12+ months. Reconstitution parameters, solvent compatibility, and post-reconstitution stability for Ipamorelin are documented in the published peer-reviewed literature and standard peptide-chemistry references.

Reference Literature

Published clinical and preclinical Ipamorelin literature is available through PubMed, Google Scholar, and other peer-reviewed databases. WWP does not provide protocol design, dosing guidance, or administration parameters. Those decisions rest with the researcher and any applicable institutional review board.

Common Questions About Ipamorelin Research

What does Ipamorelin do in research?

It activates the ghrelin receptor in the pituitary and triggers a short pulse of growth hormone release. Downstream, that GH converts to IGF-1 in the liver, which is the primary biomarker tracked in most studies. Unlike earlier GHRPs, it does this with minimal cortisol or prolactin activation.

How does Ipamorelin compare to Sermorelin?

They act through different receptors. Ipamorelin is a GHRP and targets the ghrelin receptor (amplifies the pulse). Sermorelin is a GHRH analog and targets the GHRH receptor (initiates the pulse). They are not interchangeable - researchers often pair them because the two pathways work together.

Why pair Ipamorelin with CJC-1295?

CJC-1295 (especially the No DAC version, Mod GRF 1-29) initiates a GH pulse via the GHRH receptor; Ipamorelin amplifies that same pulse via the ghrelin receptor. Combined, they produce a larger and cleaner pulse than either peptide alone - which is why the CJC/Ipa blend is the most commonly cited GHRH + GHRP combination in published research.

Is Ipamorelin FDA approved?

No. Ipamorelin is not FDA approved for any human use. Every vial WWP ships is labeled and sold strictly for laboratory and research use only.

How is Ipamorelin stored?

Unopened vials are stored at 2-8°C and stay stable for 12+ months. Once reconstituted with bacteriostatic water, the solution is kept at 2-8°C and used within 28-30 days.

Purity Guarantee

Every batch is ≥99% purity. Send us a COA from any independent test and we’ll issue store credit regardless of what it shows.