TL;DR
Ipamorelin is a synthetic pentapeptide and one of the most selective growth hormone secretagogues (GHS) developed to date. Published research positions it as a research tool for examining GHS-R1a (ghrelin receptor) signaling without the cortisol or prolactin elevation characteristic of earlier non-selective GHS compounds.
Research use only. Ipamorelin has not received FDA approval for any human therapeutic indication and is sold strictly for in-vitro laboratory research purposes.
What is Ipamorelin?
Ipamorelin is a synthetic pentapeptide and one of the most selective growth hormone secretagogues (GHS) developed to date. Published research positions it as a research tool for examining GHS-R1a (ghrelin receptor) signaling without the cortisol or prolactin elevation characteristic of earlier non-selective GHS compounds.
Research-grade Ipamorelin is supplied as a lyophilized powder with batch-specific Certificate of Analysis verification at ≥99% purity by HPLC.
Molecular Properties
| Property | Value |
|---|---|
| Molecular formula | C₃₈H₄₉N₉O₅ |
| Molecular weight | 711.85 g/mol |
| Amino acid count | 5 |
| Purity standard | ≥99% (HPLC verified) |
| Lyophilized storage | -20°C, 24–36 months |
| Reconstitution vehicle | Bacteriostatic water (primary), 0.6% acetic acid or saline (alternative) |
Proposed Mechanisms of Action
Published preclinical research has proposed several complementary mechanisms through which Ipamorelin may exert observed effects in laboratory models. No single mechanism has been fully validated in human contexts.
Selective GHS-R1a agonism
Ipamorelin binds growth hormone secretagogue receptor-1a with high selectivity, triggering pulsatile GH release via hypothalamic-pituitary axis signaling.
Cortisol-sparing profile
Unlike earlier GHS compounds (GHRP-6, GHRP-2), published work consistently reports minimal elevation of ACTH, cortisol, or prolactin — a key research advantage.
Calcium-dependent signaling
Activation of the IP3-calcium pathway in somatotroph cells, with downstream consequences for GH vesicle release kinetics.
Research Applications
Somatotropic axis research
Dose-response studies of GH pulsatile release, often in combination with CJC-1295 for complementary GHRH + GHS research protocols.
IGF-1 pathway studies
Research examining downstream IGF-1 elevation and tissue-level IGF signaling following GHS administration.
Comparative GHS pharmacology
Benchmark compound in studies comparing newer GHS molecules against established selective agonists.
Storage and Reconstitution
- Lyophilized at -20°C in original sealed vial; typical shelf life 24–36 months.
- Reconstitution with bacteriostatic water (0.9% benzyl alcohol) is standard. Alternative vehicles include sterile saline or dilute acetic acid depending on experimental requirements.
- Reconstituted solution stored at 2–8°C, used within 7–28 days.
- Avoid repeated freeze-thaw of reconstituted peptide.
- Handling: Follow institutional biosafety protocols; use only in qualified research settings.
Regulatory Considerations
As of early 2026, Ipamorelin has no investigational human therapeutic indication. The peptide continues to be available for strictly in-vitro research purposes when properly labeled, sold to qualified researchers, and handled under appropriate institutional biosafety protocols. Researchers should consult current FDA guidance and institutional policies before acquiring any research peptide.
Research Gaps
Despite the substantial published literature on Ipamorelin:
- Human pharmacokinetic and pharmacodynamic data remains limited.
- Proposed mechanisms require further validation in human-relevant systems.
- Long-term safety data across species is incomplete.
- Dose-response optimization for specific research applications continues to be an active research question.
- Independent cross-laboratory replication of specific findings is uneven across the literature.
These gaps represent ongoing research opportunities for careful, well-designed preclinical investigation using research-grade material with verified Certificate of Analysis.
Frequently Asked Questions
Is Ipamorelin approved for human use?
No. Ipamorelin has no investigational therapeutic indication. It is sold exclusively for in-vitro laboratory research in qualified research settings.
What purity standard should research-grade Ipamorelin meet?
Quality research-grade material should be ≥99% purity as verified by HPLC with a batch-specific Certificate of Analysis. Aureum Peptides provides COAs with every shipment and maintains a searchable COA portal.
How is Ipamorelin typically reconstituted for research?
Bacteriostatic water is the most common reconstitution vehicle. Alternative vehicles (sterile saline, dilute acetic acid) may be used depending on specific experimental protocols.
How long is reconstituted Ipamorelin stable?
Once reconstituted, the peptide is generally stored at 2–8°C and used within 7–28 days depending on specific handling and vehicle. Avoid repeated freeze-thaw cycles.
Where can I verify the Certificate of Analysis for my batch?
Aureum Peptides includes a batch-specific COA with every shipment and maintains an online COA portal accessible using the batch number printed on your vial.
References
- Raun K et al. Eur J Endocrinol. 1998.
- Gobburu JV et al. Pharm Res. 1999.
- Johansen PB et al. 1999.
- Sinha DK et al. 2020.
- Jiménez-Reina L et al. Histol Histopathol. 2002.
(Reference list abbreviated. Full bibliography with DOIs available on request.)
Shop Research-Grade Ipamorelin
Order research-grade Ipamorelin from Aureum Peptides: Ipamorelin product page
All peptides ship with batch-specific Certificate of Analysis, ≥99% purity verification, and cold-chain logistics. Same-day dispatch on orders placed before 2:00 PM EST.
Disclaimer: This article summarizes published preclinical research for educational purposes to support qualified research activities. The information herein does not constitute research information, therapeutic claims, or recommendations for human use. Ipamorelin is not approved by the FDA for any therapeutic indication. Always consult institutional policies and applicable regulations when conducting research with peptides.
Last reviewed: 2026-04-21
Author: Aureum Peptides Scientific Writing Team
Category: Somatotropic Research
Tags: Ipamorelin, GHS, growth hormone secretagogue, pentapeptide
