Reviewed Mar 2026 | Sources: PubMed

Ipamorelin vs GHRP-2: Head-to-Head Comparison

Both are ghrelin mimetics that stimulate GH release, but GHRP-2 is more potent at the cost of greater side effects. Ipamorelin is considered the cleanest GHRP with virtually no impact on cortisol or prolactin, while GHRP-2 causes stronger GH release but also increases appetite and cortisol.

Side-by-Side Comparison

DimensionIpamorelinGHRP-2
Evidence LevelPhase II trialsExtensive clinical studies, well-characterized
FDA StatusNot approvedNot approved
GH Release PotencyModerate, selective GH releaseStrong GH release, one of the most potent GHRPs
Side EffectsMinimal; no cortisol or prolactin increaseIncreases cortisol, prolactin, and appetite
Appetite StimulationNone to minimalSignificant hunger increase
MechanismSelective ghrelin receptor agonistNon-selective ghrelin receptor agonist
CostModerateLow to moderate
Evidence Level
Ipamorelin
Phase II trials
GHRP-2
Extensive clinical studies, well-characterized
FDA Status
Ipamorelin
Not approved
GHRP-2
Not approved
GH Release Potency
Ipamorelin
Moderate, selective GH release
GHRP-2
Strong GH release, one of the most potent GHRPs
Side Effects
Ipamorelin
Minimal; no cortisol or prolactin increase
GHRP-2
Increases cortisol, prolactin, and appetite
Appetite Stimulation
Ipamorelin
None to minimal
GHRP-2
Significant hunger increase
Mechanism
Ipamorelin
Selective ghrelin receptor agonist
GHRP-2
Non-selective ghrelin receptor agonist
Cost
Ipamorelin
Moderate
GHRP-2
Low to moderate

Peptide Overviews

Ipamorelin

BHuman Studies

Ipamorelin is a selective growth hormone secretagogue that stimulates growth hormone release from the pituitary gland without significantly affecting cortisol or prolactin levels.

Growth Hormone SecretagoguesNot Approved
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GHRP-2

BHuman Studies

GHRP-2 is a synthetic hexapeptide growth hormone secretagogue. It is one of the most potent GHRPs and has been used in clinical research for GH deficiency diagnosis.

Growth Hormone SecretagoguesNot Approved
View full GHRP-2 profile →

Ipamorelin vs GHRP-2: FAQ

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This content is for informational and educational purposes only and does not constitute medical advice, diagnosis, or treatment recommendations.

Always consult a qualified healthcare provider before starting, stopping, or modifying any treatment. Do not disregard professional medical advice based on information found on this site.

No claims of therapeutic efficacy are made for substances that are not FDA-approved for the discussed indications. Research citations reflect published findings and do not imply endorsement.