Ipamorelin is the most selective growth hormone secretagogue available — a pentapeptide (MW ~711.9 Da) that releases GH with potency comparable to GHRP-6 while producing 90% less cortisol and no meaningful ACTH elevation, even at doses 200-fold above the effective threshold. That selectivity profile is why ipamorelin replaced GHRP-2 and GHRP-6 as the preferred GH secretagogue in the research community.
This article applies 7 verification checks to ipamorelin using data from Peptigrity's independent lab tests, community reviews, and reviewed peptide shops. Peptigrity does not sell peptides or recommend vendors.
What Is Ipamorelin and Why Is Selectivity the Key Feature?
Ipamorelin is a synthetic pentapeptide (Aib-His-D-2-Nal-D-Phe-Lys-NH₂) and selective GHS-R1a (ghrelin receptor) agonist developed by Novo Nordisk — the first GHRP-receptor agonist with GH selectivity comparable to GHRH itself.
The landmark study "Ipamorelin, the first selective growth hormone secretagogue" (Raun et al., Eur J Endocrinol 1998) established ipamorelin's defining property. In conscious swine, ipamorelin released GH with an ED₅₀ of 2.3 nmol/kg — comparable to GHRP-6 (3.9 nmol/kg). GHRP-6 and GHRP-2 both elevated ACTH and cortisol at GH-releasing doses. Ipamorelin did not — even at concentrations exceeding 200-fold the ED₅₀ for GH release. No elevation of FSH, LH, PRL, or TSH was observed at any dose tested.
This selectivity is why ipamorelin is preferred over earlier GH secretagogues. GHRP-2 produces stronger acute GH spikes but elevates cortisol and prolactin. GHRP-6 triggers intense hunger via hypothalamic NPY/AgRP neuron activation. Hexarelin desensitises rapidly with repeated use. Ipamorelin provides GH release without these confounding effects.
Ipamorelin is most commonly paired with CJC-1295 (without DAC) for synergistic dual-receptor GH stimulation — CJC-1295 amplifies GH pulse amplitude via the GHRHR/cAMP pathway, Ipamorelin modulates pulse frequency via the GHSR/calcium pathway. It is also purchased as a standalone compound.
Regulatory status: ipamorelin was placed on FDA Category 2 in 2023 but removed in September 2024 when nominators withdrew their submissions. Not currently restricted for compounding. Ipamorelin reached Phase 2 clinical trials for post-surgical ileus recovery (Helsinn Healthcare) but has not achieved FDA approval. WADA bans it under S2 (peptide hormones and growth factors).
What Makes a Pentapeptide Different to Verify?
Ipamorelin is the smallest peptide in the buying guides cluster at only 5 amino acids — easier to synthesise, cheaper to produce, but carrying a different quality risk: stereochemical errors from its non-proteinogenic amino acids that HPLC catches better than mass spectrometry.
For context on size: BPC-157 = 15 amino acids (~1,419 Da), TB-500 = 43 AA (~4,963 Da), semaglutide = 31 AA (~4,113 Da), tirzepatide = 39 AA (~4,813 Da). Ipamorelin = 5 AA (~711.9 Da). Smaller peptide means cheaper synthesis, more vendors offering it, wider quality range, and some cutting corners on purification because margins are tight.
Ipamorelin contains 2 non-proteinogenic amino acids (Aib and D-2-Nal) and 1 D-amino acid (D-Phe). Incorrect stereochemistry during synthesis — racemisation of D-Phe to L-Phe, for example — produces variants that are inactive or differently active. These racemised variants have the same molecular weight as correctly synthesised ipamorelin. Mass spectrometry cannot differentiate them. HPLC can — racemised variants elute at different retention times, appearing as impurity peaks on the chromatogram.
This inverts the usual verification emphasis from the GLP-1 buying guides, where MS identity is the critical check (catching semaglutide→tirzepatide substitution). For ipamorelin, HPLC purity is more informative than MS identity because the compound-specific risks are stereochemical, not substitution-based.
7 Things to Check Before Ordering Ipamorelin
The same 7 checks apply — with ipamorelin, HPLC purity carries even more weight than usual because stereochemical errors in its non-proteinogenic amino acids produce variants that mass spectrometry alone cannot differentiate.
1. Third-Party HPLC Purity (≥98%)
HPLC is particularly important for ipamorelin. It detects racemised D-amino acid variants and synthesis impurities that MS cannot differentiate by mass alone. Cross-reference on peptigrity.com/lab-tests — filter by "Ipamorelin." The study "Peptide Impurities in Commercial Synthetic Peptides" (PMC2238048) demonstrated that contamination at 1% produced measurable biological effects — for a pentapeptide with non-proteinogenic residues, this threshold matters.
2. Mass Spectrometry Identity (~711.9 Da)
MS confirms the compound is ipamorelin and not a different GH secretagogue. Each GHRP has a distinct MW: ipamorelin ~711.9 Da, GHRP-2 ~817.9 Da, GHRP-6 ~873.0 Da, hexarelin ~887.0 Da. If MS shows a different MW, you received a different compound. MS is a quick identity check — but for ipamorelin specifically, HPLC purity matters more because stereochemical errors produce the same MW. See Mass Spectrometry for Peptides: Verifying Identity & Molecular Weight for the methodology.
3. CoA From a Named, Verifiable Lab
Verify through the lab's portal: Janoshik (Task #), Chromate (QR code + Job Number), Freedom Diagnostics (online system). Confirm the CoA says "Ipamorelin" and lists MW consistent with ~711.9 Da — not a different GHRP. See Red Flags in Peptide Certificates of Analysis for the fraud detection checklist.
4. Independent Data on Peptigrity
Search peptigrity.com/lab-tests for the vendor + Ipamorelin. Check the shop's profile on peptigrity.com/shops — trust score, ✓ Lab Verified badge, and test count. Independent community-submitted data carries more weight than vendor-published CoAs.
5. Community Reviews
Read reviews on the vendor's Peptigrity page. Each includes 5 sub-ratings: Quality, Delivery, Pricing, Customer Service, and Product Accuracy. Ipamorelin buyers often also purchase CJC-1295 from the same vendor — check reviews for both compounds to assess consistency.
6. Vial Presentation and Storage
Lyophilised ipamorelin should be a white to off-white powder. Not lipidated — standard storage profile with no heightened oxidation sensitivity. Most RUO vendors ship at ambient temperature. For 2–5 day domestic transit of lyophilised powder, this is acceptable. Store at −20°C on arrival. After reconstitution: 2–8°C, use within 28 days.
7. Pricing Reality Check
Research-grade ipamorelin pricing (March 2026):
2 mg vial: $15–40.
5 mg vial: $25–60.
10 mg vial: $40–100.
Ipamorelin is one of the cheapest research peptides to produce — only 5 amino acids. Below $10 for 2 mg is still suspicious: even low-cost synthesis requires purification and quality control. Often bundled with CJC-1295 at a discount. See Peptide Purity Standards: What Percentage Is Actually Acceptable? for the quality-price framework.
Ipamorelin on Peptigrity's Lab Test Database
Filter by Ipamorelin at peptigrity.com/lab-tests to compare independent purity data across vendors before ordering.
Community-submitted data from third-party laboratories represents real products from real buyers. Use the data before ordering. If a vendor has multiple ipamorelin tests from named labs, that is the strongest quality signal available. Browse the Ipamorelin peptide guide for the compound profile alongside lab data.
Ipamorelin Standalone vs CJC-1295 + Ipamorelin Blend
Ipamorelin is most commonly paired with CJC-1295 (no DAC) for synergistic GH release — but buying it standalone gives you verification control and flexibility to pair with different GHRH analogs.
The synergy: CJC-1295 targets the GHRH receptor (cAMP/PKA pathway, pulse amplitude). Ipamorelin targets the ghrelin receptor (GHSR/calcium pathway, pulse frequency). Two receptors, two signalling cascades — combined GH output exceeds either compound alone.
Standalone ipamorelin makes sense when you already have CJC-1295 separately, when you want to pair with a different GHRH analog (sermorelin, tesamorelin), or when you want to verify each compound independently through Peptigrity before combining. Pre-mixed blends are convenient but introduce additional verification challenges — two identities, two purities, ratio confirmation, and DAC version exclusion. For blend-specific verification, see Peptigrity's CJC-1295 & Ipamorelin buying guide.
Frequently Asked Questions
What purity should research-grade ipamorelin have?
≥98% HPLC from a third-party lab. HPLC is especially important for ipamorelin because stereochemical errors from its non-proteinogenic amino acids produce variants that MS cannot differentiate. Cross-reference on peptigrity.com/lab-tests.
How much does research-grade ipamorelin cost?
2 mg: $15–40, 5 mg: $25–60, 10 mg: $40–100. One of the cheapest research peptides to produce. Below $10 for 2 mg is suspicious. Often bundled with CJC-1295 at a discount. Compare across vendors on peptigrity.com/shops.
Why is ipamorelin preferred over GHRP-2 and GHRP-6?
Selectivity. Ipamorelin releases GH with comparable potency but produces 90% less cortisol and no ACTH elevation — even at 200× the effective dose (Raun et al., 1998). GHRP-2 and GHRP-6 both elevate cortisol and prolactin at research doses. GHRP-6 additionally triggers intense hunger. Ipamorelin provides the cleanest hormonal profile of any GH secretagogue.
Is ipamorelin FDA-approved?
No. Ipamorelin reached Phase 2 clinical trials for post-surgical ileus recovery but has not achieved FDA approval. It was placed on FDA Category 2 in 2023, then removed in September 2024. Not currently restricted for compounding. WADA bans it under S2 for competitive athletes.
Should I buy ipamorelin standalone or as a blend with CJC-1295?
Standalone gives more verification control — the compound is verified independently with its own HPLC, MS, and Peptigrity cross-reference. The blend is convenient but introduces additional verification challenges. Start with individual vials from a new vendor, switch to blends once trust is established through verified data.
For the complete buyer verification framework, see How to Verify Peptide Quality Before You Buy and What to Look for in a Peptide Shop: A Buyer's Checklist. Browse all peptide shops ranked by trust score.
This article is for educational and informational purposes only and does not constitute medical advice. Ipamorelin is a research compound not approved by the FDA for human use. Human clinical data is limited. Always consult a qualified healthcare provider before using any peptide or research compound. Peptigrity is an independent review platform and does not sell, endorse, or recommend specific products or vendors.
