Verified July 2026 · Cited to primary sources

GHRP-2: Evidence Grade D. Animal studies only, unproven in humans.

Grade DResearch-onlySafety: amber

The honest verdict

The strongest GH-pulse trigger of the old GHRPs and a genuine diagnostic drug in Japan, which is more legitimacy than most peptides here can claim. But a single approved diagnostic test is not evidence it builds muscle, no such human trial exists, and in the US it is research-only. Grades D for the use case people search for.

GHRP-2 at a glance

Class
Growth hormone secretagogue (ghrelin/GHS-R1a agonist, hexapeptide)
Mechanism
Ghrelin-receptor (GHS-R1a) agonist that drives some of the highest GH pulse amplitudes per unit dose in its class. It works partly independent of your own GHRH: in patients with a non-functional GHRH receptor it still produced a 4.5-fold GH rise, showing a direct action on pituitary somatotrophs. It also stimulates appetite and modestly raises ACTH, cortisol and prolactin.
Also known as
Growth Hormone Releasing Peptide-2, Pralmorelin, KP-102, GHRP2
Research applications
  • Diagnostic GH-stimulation testing (pralmorelin, approved in Japan)
  • Appetite / ghrelin-system research
  • Growth hormone deficiency research
Forms
Lyophilized powder for reconstitution (research supply), Subcutaneous injection (research use), Approved diagnostic injection in Japan (pralmorelin)
Legal status
Research-only
WADA (anti-doping)
Prohibited at all times (S2.2.4, GH-releasing peptides), GHRP-2 (pralmorelin) named on the WADA Prohibited List
Evidence grade
Grade DAnimal studies only, unproven in humans

How we grade evidence

Every grade comes from a fixed A to F rubric: human-trial strength, not hype or affiliate status. Last verified July 6, 2026.

What is GHRP-2?

The most potent GH-pulse trigger of the classic GHRPs per dose, and it is actually an approved diagnostic agent for GH deficiency in Japan. But like its cousins it also spikes appetite and modestly raises cortisol and prolactin, and there is no human trial showing it builds muscle.

Ghrelin-receptor (GHS-R1a) agonist that drives some of the highest GH pulse amplitudes per unit dose in its class. It works partly independent of your own GHRH: in patients with a non-functional GHRH receptor it still produced a 4.5-fold GH rise, showing a direct action on pituitary somatotrophs. It also stimulates appetite and modestly raises ACTH, cortisol and prolactin.

How strong is the evidence for GHRP-2?

GHRP-2 has the best-defined human pharmacology of the GHRPs (it is a licensed GH-stimulation diagnostic in Japan) and controlled human studies document both its GH-releasing potency and its appetite effect (Laferrere 2005; Gondo 2001). But 'approved as a one-time diagnostic test' is not the same as 'proven to build muscle over time.' There is no randomized controlled trial measuring muscle, body composition, recovery or any physique outcome from chronic use. Strong human pharmacology, no efficacy trial for the marketed use, so D.

Primary sources (3)

  1. Laferrere 2005, J Clin Endocrinol Metab, GHRP-2, like ghrelin, increases food intake ~36% in healthy men and raises GH
  2. Gondo 2001, J Clin Endocrinol Metab, GHRP-2 stimulates GH secretion even in patients with a mutated GHRH receptor (GHRH-independent action)
  3. WADA Prohibited List, GH-releasing peptides incl. GHRP-2 (pralmorelin) banned at all times (S2.2.4)

What is GHRP-2 used for?

GHRP-2 is marketed for the goals below. See how it ranks against other peptides in each, by evidence, not hype.

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What does GHRP-2 cost, and how do you access it legally?

Typical cost

UNKNOWN

No US FDA-approved or compoundable route for physique use, so no legitimate price exists here. Sold in the US only as a research chemical, which we do not price.

No legal supervised access route right now.

GHRP-2 has no compliant US route today. Vials sold "for research use only" are a gray-market fig-leaf, not a legal loophole, so we don't link them. If you pursue GHRP-2, do it with a licensed clinician, and re-check its legal status first.

Is GHRP-2safe? Side effects & risks

Limited human safety data, no major documented harms

In the US it is not an FDA-approved drug and cannot be legally compounded (approval as pralmorelin is limited to diagnostic use in Japan). As a single diagnostic dose it has a decent human tolerability record, but chronic self-administration is unstudied. Expect strong appetite stimulation and a modest cortisol/prolactin rise, plus the class risks of sustained GH elevation (water retention, joint discomfort, insulin-sensitivity concerns). Gray-market supply is the practical hazard: FDA testing found roughly 40% of online/compounded peptides were mislabeled for dose or ingredients.

Medical disclaimer: This page is independent editorial information, not medical advice, and Best Peptide For That is not a medical provider. We do not provide dosing. Talk to a licensed clinician before starting, stopping, or changing any peptide or medication. Full medical disclaimer.

FAQ

GHRP-2 FAQ

Is GHRP-2 approved anywhere?

Yes, as pralmorelin it is approved in Japan as a diagnostic agent to test for growth hormone deficiency. That is a one-time diagnostic use, not approval for muscle building or long-term use, and it is not FDA-approved in the US.

Is GHRP-2 stronger than GHRP-6?

Per dose, GHRP-2 generally produces larger GH pulses and is considered the more potent GH releaser. Both stimulate appetite and both nudge cortisol and prolactin up. Neither has human evidence of a muscle-building benefit.

Does GHRP-2 build muscle?

No human study shows that. It reliably raises GH and IGF-1 acutely, but no controlled trial has measured lean mass, strength or fat loss from ongoing use, which is why it grades D.

Is GHRP-2 banned in sport?

Yes. GH-releasing peptides including GHRP-2 (pralmorelin) are prohibited at all times under WADA section S2.2.4.

From our portfolio

Tracking GHRP-2?

Titrate is an iOS app for logging doses, schedules and progress over time, with a reconstitution calculator built in. It tracks, it does not prescribe.

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How we grade the evidence →Are peptides safe? →FDA peptide status 2026 →

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