Ipamorelin

Human clinical Growth Hormone In 1 protocol 3 sources

Ipamorelin is a highly selective growth hormone secretagogue and ghrelin receptor agonist. Research indicates it stimulates the pituitary gland to release endogenous growth hormone without significantly elevating cortisol or prolactin levels, making it a primary focus in studies on anti-aging, muscle preservation, and recovery.

01Dosing reference

Amount

200-300 mcg per dose

Frequency

1 to 2 times daily (often morning and/or before bed) via SubQ injection

Cycle

8-12 weeks on, followed by a 4-week off period

Reference figures, not a recommendationThese values reflect amounts described in the literature and vendor documentation this database indexes. Use the reconstitution calculator to convert them into syringe units.

02Mechanism of action

Ghrelin Receptor Activation

Ipamorelin binds to and activates the ghrelin/growth hormone secretagogue receptor (GHSR-1a) in the pituitary gland.

Growth Hormone Secretion

This activation triggers a pulsatile release of growth hormone (GH) into the bloodstream without significantly affecting other pituitary hormones.

IGF-1 Elevation and Tissue Repair

Increased GH stimulates the liver to produce Insulin-like Growth Factor 1 (IGF-1), which promotes cellular repair, muscle growth, and fat metabolism.

03Human evidence

Ipamorelin safely and effectively stimulated growth hormone release in healthy young men.

A randomized, double-blind, placebo-controlled study evaluating the GH-releasing potency and safety of Ipamorelin in human subjects.

Investigated for the treatment of post-operative ileus (POI) to accelerate gastrointestinal recovery.

Phase II clinical trials explored its efficacy in bowel motility post-surgery, though development for this specific indication was later halted.

04Preclinical evidence

Ipamorelin increased longitudinal bone growth and body weight in rats.

Animal models demonstrated its ability to stimulate bone formation and growth without altering bone resorption markers.

Prevented corticosteroid-induced muscle wasting and nitrogen loss.

Studies in rats showed that Ipamorelin could counteract the catabolic effects of high-dose glucocorticoids.

05What is known vs. unknown

Reasonably established

Highly selective for growth hormone release without spiking cortisol or prolactin.
Operates as a ghrelin mimetic but typically does not induce the intense hunger associated with other GHRPs.
Often researched in combination with GHRH analogs (like CJC-1295) for a synergistic effect on GH pulses.
Demonstrates a favorable safety profile in short-term clinical and preclinical studies.

Unknowns & limits

Long-term safety and efficacy data in humans for anti-aging or body composition purposes are lacking.
The exact optimal dosing protocols for different therapeutic goals remain under investigation.
Potential for receptor desensitization with prolonged, uninterrupted use is not fully understood.

06Safety & regulatory context

Regulatory statusIn clinical trials, Ipamorelin has been generally well-tolerated, with reported side effects being mild and transient, such as injection site reactions, slight flushing, or mild headaches. Unlike other secretagogues, it does not significantly elevate cortisol, prolactin, or aldosterone levels. It is not FDA-approved for human use and is classified as an investigational compound available for research purposes only. Furthermore, it is prohibited in competitive sports by the World Anti-Doping Agency (WADA).

07Compared with GHRP-6

Ipamorelin vs. GHRP-6

Key difference

Ipamorelin is highly selective and does not significantly increase cortisol, prolactin, or induce intense hunger, whereas GHRP-6 is known for stimulating appetite and elevating stress hormones at higher doses.

When researchers discuss each

Researchers discuss Ipamorelin when seeking a 'clean' GH pulse with minimal side effects, and GHRP-6 when appetite stimulation is a desired therapeutic outcome.

08Appears in protocols

💪 Ipamorelin Solo Protocol

300 mcg (30 units)Monday-Friday (5 days on / 2 days off)

09Glossary

Secretagogue

A substance that promotes the secretion of another substance, such as a peptide that stimulates the release of growth hormone.

Ghrelin

A hormone produced in the stomach that stimulates appetite and also binds to receptors in the brain to trigger growth hormone release.

IGF-1

Insulin-like Growth Factor 1, a hormone produced by the liver in response to growth hormone that mediates many of its growth-promoting effects.

10Knowledge check

Q1What makes Ipamorelin unique compared to other growth hormone releasing peptides like GHRP-6?

Q2Which receptor does Ipamorelin bind to in order to stimulate growth hormone release?

Q3Which limitation in the dossier most reduces confidence about Ipamorelin’s long-term benefits for anti-aging or body composition?

Q4Per the dossier, in what research context are investigators most likely to choose Ipamorelin instead of GHRP-6?

Q5Which regulatory or safety statement about Ipamorelin is supported by the dossier?

11Sources

More in Growth Hormone

See all

Sermorelin

Growth Hormone

FDA-approved context

Sermorelin is a synthetic peptide consisting of the first 29 amino acids of naturally occurring growth hormone-releasing hormone (GHRH). It stimulates the pituitary gland to naturally produce and release human growth hormone (hGH), making it a subject of research for age-related growth hormone decline, body composition, and vitality.

200-500 mcg/day

Tesamorelin

Growth Hormone

FDA-approved context

Tesamorelin is a synthetic analogue of growth hormone-releasing hormone (GHRH) that stimulates the pituitary gland to secrete growth hormone. It is FDA-approved for reducing excess visceral abdominal fat in HIV-infected patients with lipodystrophy and is being researched for potential cognitive benefits.

2 mg/day

Hexarelin

Growth Hormone

Human clinical

Hexarelin is a potent, synthetic hexapeptide and growth hormone secretagogue (GHS) that stimulates the release of growth hormone. Research indicates it is one of the strongest GH-releasing peptides available, offering potential benefits for muscle growth, fat loss, and cardiovascular health without significantly increasing appetite.

100-200 mcg per dose

Research and educational use onlyNothing on this site is medical advice, a prescription, or a recommendation for human use. Compounds documented here are research chemicals. Consult a qualified clinician before making any health decision.