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GHRP-2: HGH / Somatropin research guide

Not medical advice. GHRP-2 is a research compound. This guide does not provide dosing, diagnosis, therapy recommendations, or claims about effects in humans.

What GHRP-2 is

GHRP-2 (pralmorelin) is a high-affinity ghrelin receptor agonist and the first growth hormone secretagogue to reach clinical approval as a diagnostic agent for growth hormone deficiency in Japan.

One-paragraph overview from our research datasheet — still scientific, but faster to read than the full mechanism list below.

GHRP-2 (Pralmorelin), potent hexapeptide GHS-R1a agonist and first clinically approved growth hormone secretagogue for GHD diagnostic applications.

Research contexts

Peer-reviewed literature typically discusses GHRP-2 in specific experimental settings. The points below reflect how the scientific community frames this compound—not as health claims, but as the research questions being asked.

Research vs. personal use: Literature describes experiments in controlled lab and animal models. This is distinct from any real-world use; our products are for laboratory research only.

Typical study contexts

Pituitary GH release patterns, receptor signalling, and metabolic readouts in compliant animal research.

Comparisons between secretagogues and exogenous GH in model organisms, focusing on endocrine biology.

Peer-reviewed preclinical work sometimes describes experiments that track whether high-affinity GHS-R1a agonist with 2–3-fold greater GH release potency than GHRP-6 in preclinical models

Peer-reviewed preclinical work sometimes describes experiments that track whether first growth hormone secretagogue approved clinically, diagnostic agent for GHD in Japan (GHRP Kaken 100)

Peer-reviewed preclinical work sometimes describes experiments that track whether multi-route administration: subcutaneous, intravenous, oral, and intranasal bioactivity confirmed

Peer-reviewed preclinical work sometimes describes experiments that track whether stimulates appetite via hypothalamic ghrelin receptor activation supporting orexigenic research

Why HGH / Somatropin research matters

Growth-hormone axis peptides are researched for how they signal through the GH/IGF pathway in animals and cells. Studies focus on endocrine biology and metabolism, not on prescribing or outcomes in people.

Mechanisms (technical review)

Our datasheet lists mechanistic themes observed in preclinical work. These are research endpoints, not health claims. They help scientists understand and compare pathways.

High-affinity GHS-R1a agonist with 2–3-fold greater GH release potency than GHRP-6 in preclinical models

First growth hormone secretagogue approved clinically, diagnostic agent for GHD in Japan (GHRP Kaken 100)

Multi-route administration: subcutaneous, intravenous, oral, and intranasal bioactivity confirmed

Stimulates appetite via hypothalamic ghrelin receptor activation supporting orexigenic research

Rapid onset with peak GH response at 15 minutes post-administration

Synergistic GH release when combined with GHRH analogues through complementary receptor pathways

Lab handling & preparation

Storage requirements: Lyophilised powder: store in freezer (−20 °C). Reconstituted: refrigerate 1–6 °C, away from sunlight. Use within the validated stability window for the specific batch and formulation. · Learn best practices in our detailed storage guide.

Research dosing context: Literature typically discusses 100–300 mcg subcutaneously · 2–3 times daily · Functional t½ ≈ 15–30 min; peak GH at ~15 min post-administration; GH elevation persists ~60 min; oral bioavailability demonstrated but low (~0.3%); approved diagnostic dose: 100 mcg IV (GHRP Kaken 100). Rapid degradation in vivo, multiple daily administrations required for sustained effects.

Preparation steps: Follow our detailed reconstitution guide, use the calculator tool for volume confirmation, and always verify purity with the COA reading guide.

Common Questions People Are Asking

What is GHRP-2?

GHRP-2 (pralmorelin) is a synthetic six-amino-acid growth hormone secretagogue that binds the ghrelin receptor (GHS-R1a) on the pituitary to trigger a sharp pulse of the body's own growth hormone. It is the first GH secretagogue to gain any regulatory approval, used as a GH-deficiency diagnostic in Japan. Supplied here as a lyophilised research-grade powder for laboratory use only.

What is the difference between GHRP-2 and GHRP-6?

Both are hexapeptide ghrelin-receptor agonists, but GHRP-2 releases more growth hormone per dose while producing a milder appetite (orexigenic) effect. GHRP-6 is the original of the family and the strongest hunger stimulant. Researchers reach for GHRP-2 when they want GH output without the pronounced appetite signal of GHRP-6.

How does GHRP-2 compare with ipamorelin?

GHRP-2 is a stronger GH releaser per dose, but it also produces modest cortisol, ACTH, and prolactin elevation that ipamorelin does not. Ipamorelin is cleaner and more selective; GHRP-2 is more potent and has a richer clinical pharmacokinetic dataset. The choice depends on whether the research protocol prioritises selectivity or potency.

What is the half-life of GHRP-2?

GHRP-2 is short-acting, with a functional half-life on the order of 15-30 minutes. The growth-hormone pulse it triggers typically peaks around 15 minutes after subcutaneous administration and returns toward baseline within roughly an hour, which is why research protocols describe multiple separated doses rather than a single sustained one.

Does GHRP-2 increase appetite?

Moderately. GHRP-2 activates hypothalamic ghrelin receptors enough to produce a noticeable increase in hunger in research subjects, but less dramatically than GHRP-6, which is the strongest orexigenic member of the family. The appetite effect is a direct consequence of acting on the same receptor as natural ghrelin.

Why is GHRP-2 stacked with CJC-1295?

GHRP-2 and CJC-1295 (a GHRH analogue) act on two different receptors - the ghrelin receptor and the GHRH receptor - that converge on growth-hormone release. Combining them in research models produces a larger, cleaner GH pulse than either peptide alone, which is the standard rationale for pairing a GHRP with a GHRH analogue.

Can GHRP-2 be dosed orally?

Oral bioactivity has been demonstrated across multiple species, though absolute oral bioavailability is quite low (roughly 0.3%). That means meaningful oral exposure requires much larger amounts than subcutaneous or IV, but the route does function in research protocols, and intranasal delivery has also been validated.

How should GHRP-2 be stored?

Keep the lyophilised powder frozen at −20 °C. After reconstitution with bacteriostatic water, refrigerate at 1-6 °C and protect from light. GHRP-2 is reasonably stable in solution within the standard peptide-handling window.

Is this page medical advice? Can I use GHRP-2 for my health?

No, and no. This article is educational only. We do not provide dosing, medical recommendations, or health claims. Our products are sold strictly for laboratory research, not for personal use of any kind.

Where do I find GHRP-2 specs, purity certificates and pricing?

Open the shop listing via “View product details.” There you will see batch specs, the Certificate of Analysis (COA), concentration, purity grade, and available SKUs with current pricing.

Related peptide guides

Other compounds researchers often read about alongside GHRP-2.

HGH 191 AA - companion guide

Tesamorelin - companion guide

Sermorelin - companion guide

HGH Fragment 176-191 - companion guide

Scientific sources & further reading

Primary literature and registries for GHRP-2, plus mainstream coverage of the peptide category. Research use only - not medical advice.

Databases & literature:

PubMed: peer-reviewed literature on GHRP-2

ClinicalTrials.gov: registered studies on GHRP-2

GHRP-2: Wikipedia

Peptides in the news:

WebMD: consumer health reference

BBC News: Health

CNN Health: “Peptides: what to know about the wellness trend”

Sky News: “Can peptides make America healthy again?”

Sky News: “Inside the exploding US peptides craze” (video)

Sky News Australia: “Black market peptide trade explodes as influencers fuel uptick in use”

Sky News Australia: “Backyard peptide boom sparks alarm” (video)

Sky News Australia: “Oprah reveals struggle with shame of weight-loss drugs”

Ready to order? View full product specs

Access concentration, batch info, variants, and current pricing on our shop.

Also known as: Pralmorelin, KP-102, GPA-748, Growth Hormone Releasing Peptide-2, GHRP Kaken 100, Pralmorelin Hydrochloride, Pralmorelin Dihydrochloride

Premium research peptides at >99% HPLC-verified purity, third-party tested by Janoshik Analytical with a Certificate of Analysis on every lot. Shipped lab-direct, discreet and cold-chain, worldwide. For laboratory research use only.

Research use only (RUO). All products are sold strictly for laboratory and research purposes — not for human or veterinary consumption. Purchasers must be 21 or older.

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Research use only — not for human consumption. All products are supplied strictly for laboratory research purposes.