Ipamorelin

Ipamorelin is a synthetic pentapeptide growth hormone secretagogue and selective ghrelin receptor agonist. It was developed specifically to stimulate GH release without the cortisol, prolactin, or appetite effects associated with earlier GHRPs.

Ipamorelin is the 'clean' GHRP — the one researchers pick when they want a GH pulse without the side conversations. It does one job (GH release) and nothing else.

Binds the growth hormone secretagogue receptor (GHS-R1a) on pituitary somatotrophs, triggering GH release. Unlike GHRP-6 and GHRP-2, it does not meaningfully stimulate cortisol, prolactin, or ACTH at standard research doses, and has minimal effect on ghrelin-driven appetite signaling.

Highly selective pentapeptide GHS. Triggers GH release without cortisol, prolactin, or major hunger spikes.

1. Ipamorelin
2. GHRH and/or ghrelin receptors in the pituitary
3. Pulsatile growth hormone release
4. Downstream IGF-1, body-composition and recovery endpoints

A plain-English read on how much published evidence currently exists for Ipamorelin. These ratings describe the volume and maturity of the literature — not effectiveness, safety, or suitability for any use.

Current limitations: most compounds in this category are studied in preclinical or small-sample settings. Absence of large controlled human trials is the single biggest limitation to keep in mind when reading any summary of Ipamorelin.

Lyophilized compounds are supplied as a dry powder. Concentration is simply the total amount in the vial divided by the volume of bacteriostatic water added:

Concentration (mg/mL) = total mg in vial ÷ mL of diluent added

Commonly supplied vial sizes

2mg or 5mg vial

Worked concentration example

5mg + 2mL BAC water → 2.5mg/mL On U-100 insulin syringe:

• • 8 units = 200mcg
• • 12 units = 300mcg

Run your own numbers with the reconstitution calculator — it converts vial size and diluent volume into mg/mL and mcg/mL.

The figures below are reported here descriptively, because they are the values most frequently cited in publicly available research literature and reference material. They are not instructions, not a protocol, and not a recommendation. These compounds are supplied for laboratory research use only and are not approved by the FDA for human consumption.

Commonly cited amounts

200–300mcg, 2–3× daily subcutaneous

Commonly cited frequency

2–3× daily (e.g., AM, post-workout, before bed)

Commonly cited study duration

8–12 weeks. Some run continuously.

Peptides are supplied freeze-dried because peptide bonds degrade far faster in solution than in a dry state. Understanding storage is part of understanding why the powder form exists at all.

• •Lyophilized powder: stored refrigerated, typically stable for months to years.
• •Reconstituted solution: refrigerated at 2–8°C, generally discussed as stable for roughly 30–60 days.
• •Heat and direct light accelerate degradation — vials are kept cool and dark.
• •Reconstituted material is not re-frozen; ice crystal formation disrupts peptide structure.
• •Bacteriostatic water contains 0.9% benzyl alcohol as a preservative, which is what allows multi-day storage after reconstitution.

More detail in the storage & handling guide and how peptide quality is evaluated.

• •Selective GHS-R activation studies
• •CJC-1295 + Ipamorelin synergy
• •Body composition and recovery research
• •Sleep architecture
• •Comparison with GHRP-2, GHRP-6, and Hexarelin

Universally described as the 'starter GHRP.' Almost every CJC-1295 conversation pairs it with Ipamorelin. Forums consistently recommend it over GHRP-6 (hunger) and Hexarelin (desensitization) for sustained research protocols.

“The clean GH-pulse peptide.”

The canonical GH stack is CJC-1295 + Ipamorelin. Compared to GHRP-2 (more potent but more cortisol/prolactin), GHRP-6 (appetite stimulation), and Hexarelin (desensitization risk).

Ipamorelin is a selective pentapeptide GHRP studied for clean, side-effect-light GH release, most often paired with CJC-1295.