GHRP-2 is a synthetic hexapeptide and ghrelin mimetic that triggers pulsatile growth hormone (GH) release by activating the growth hormone secretagogue receptor (GHS-R1a) in the pituitary and hypothalamus. Because it works through a pathway separate from GHRH, it is one of the most widely used tools for studying the GH/IGF-1 axis in preclinical research.
Researchers buy GHRP-2 when they need a potent, well-characterized secretagogue with three decades of published data behind it. If you are new to this class of compounds, start with our complete guide to peptides and our growth hormone peptide guide.
Ready to order? Select 5mg or 10mg above to buy GHRP-2 now, or open the full research description below for the mechanism, published studies, reconstitution volumes, and ordering details.
Why Buy GHRP-2 from PSPeptides?
When you buy GHRP-2 online, you are paying for three things: the peptide itself, proof that it is what the label says, and a supplier who gets it to your lab fast. PSPeptides delivers all three. Each vial is manufactured in the United States, tested by an independent laboratory, and dispatched the same business day when you order before 2 PM EST.
A purity percentage is only as good as the data behind it. That is why every lot of GHRP-2 for sale here ships with a batch-specific Certificate of Analysis showing HPLC purity and mass spectrometry identity, so you can match the lot number on your vial to real analytical data before the first experiment.
If you compare suppliers before you buy GHRP-2, look for three things: batch-level documentation, domestic shipping speed, and responsive support. PSPeptides is built around exactly those priorities, which is why researchers who buy GHRP-2 USA-made from us tend to reorder rather than shop around.
What You Get When You Buy GHRP-2 Here
- Sealed GHRP-2 vial: 5mg or 10mg of lyophilized peptide, labeled with product name, lot number, and concentration.
- Batch-specific COA: Independent HPLC purity and mass spectrometry identity results tied to your lot number.
- Discreet, protective packaging: No external branding that identifies the contents, with cushioning to protect the vial in transit.
- Tracking and support: A tracking number by email and a support team available seven days a week for reconstitution and protocol questions.
Detailed Mechanism of Action
GHRP-2 (D-Ala-D-βNal-Ala-Trp-D-Phe-Lys-NH2) is a second-generation growth hormone releasing peptide with a molecular weight of approximately 818 Da. It binds the growth hormone secretagogue receptor type 1a (GHS-R1a), a G-protein-coupled receptor expressed on pituitary somatotrophs and in the hypothalamic arcuate nucleus. Receptor activation couples through Gq/11 to phospholipase C, raising inositol trisphosphate and intracellular calcium, which drives exocytosis of stored GH.
What distinguishes GHRP-2 from GHRH is its dual site of action. At the pituitary it stimulates somatotrophs directly; at the hypothalamus it increases GHRH output and appears to blunt somatostatin tone, the body’s main brake on GH release. Bowers, who originally developed the GHRP class, described this complementary hypothalamic-pituitary mechanism as the reason GHRPs produce such robust GH pulses in both animals and humans.
Because GHRH signals through the cAMP/protein kinase A pathway while GHRP-2 signals through phospholipase C and calcium, the two pathways converge on the same somatotroph from different directions. The practical result is supra-additive GH release when they are combined, which is why many laboratories buy GHRP-2 alongside a GHRH analog such as CJC-1295 or sermorelin for GH-axis protocols.
GHRP-2 is also an agonist at the ghrelin receptor, which mediates its secondary effects on appetite, gastric motility, and the hypothalamic-pituitary-adrenal axis. Human studies have recorded modest, transient rises in cortisol and prolactin alongside the GH peak, a profile researchers should account for when selecting assays. Its D-amino acid substitutions resist enzymatic degradation, improving stability in biological matrices compared with native peptides.
Published Research
The GHRP literature begins with Cyril Bowers, whose 1998 review in Cellular and Molecular Life Sciences summarized two decades of work showing that growth hormone releasing peptides act on both the hypothalamus and the pituitary, and proposed that they mimic a then-unidentified natural hormone, a prediction confirmed a year later with the discovery of ghrelin.
The review remains the standard starting point for anyone who wants to buy GHRP-2 for mechanistic work and is available on PubMed (PMID 9893708).
Laferrère and colleagues (2005, Journal of Clinical Endocrinology & Metabolism) showed that GHRP-2 administration significantly increased ad libitum food intake in healthy men, behaving like ghrelin itself and confirming its value as a ghrelin receptor agonist. Researchers who buy GHRP-2 for appetite studies can read the abstract on PubMed (PMID 15699539).
A separate study in healthy young men found that five consecutive days of subcutaneous GHRP-2 attenuated the GH response without raising IGF-1 (PMID 9820615), a result that informs dosing frequency and washout design in longer protocols.
A 2017 review in Clinical Medicine Insights: Cardiology by Berlanga-Acosta and colleagues compiled the cytoprotective evidence for synthetic GHRPs. It reports that GHRP-2 pretreatment protected isolated rabbit hearts against post-ischemic diastolic dysfunction and improved ventricular function in a hamster model of dilated cardiomyopathy.
The same review notes reduced vascular oxidative stress in ApoE-deficient mice, with the effects attributed to GHS-R1a and CD36 receptor signaling. See PubMed (PMID 28469491) for the full appraisal.
GHRP-2 vs Alternatives
Before you buy GHRP-2, it helps to know how it compares with the two secretagogues researchers most often weigh against it: GHRP-6, its first-generation predecessor, and ipamorelin, a more selective pentapeptide.
| Feature | GHRP-2 | GHRP-6 | Ipamorelin |
|---|
| Receptor activity | GHS-R1a + ghrelin receptor | GHS-R1a + ghrelin receptor | GHS-R1a selective |
| GH release potency | Highest of the classic GHRPs | High | Moderate |
| Appetite stimulation | Moderate | Strong | Minimal |
| Cortisol / prolactin effect | Mild, transient | Mild, transient | Negligible |
| Approximate half-life | Under 1 hour | Under 1 hour | About 2 hours |
| Human study data | Extensive | Extensive | Limited |
| GHRH synergy | Strong | Strong | Strong |
| Best suited for | Potent GH pulses plus appetite and HPA research | Hunger and feeding studies | Clean GH pulses with minimal off-target effects |
Each compound has its place. Laboratories that buy GHRP-2 typically want the strongest GH pulse the classic GHRPs can deliver together with ghrelin-receptor activity, while ipamorelin suits designs that need to isolate GH release from appetite and cortisol effects. For a deeper comparison of growth hormone peptides, see our CJC-1295 and ipamorelin guide.
GHRP-2 5mg vs 10mg: Which Size Should You Order?
Both sizes are the same peptide at the same purity; the only difference is how much material is in the vial. When you buy GHRP-2 in the 5mg vial, you get a size that suits pilot studies, single short protocols, and first orders where you want to verify the product and your reconstitution workflow before scaling up.
The 10mg vial is the better choice for multi-week studies, larger animal cohorts, or stacked protocols with a GHRH analog. It lowers your cost per milligram and halves the number of reconstitutions you need to perform, which also reduces handling-related degradation. Many researchers buy GHRP-2 in 10mg vials once a protocol is established and keep a 5mg vial on hand for method development.
Not sure which size to pick? Run your planned concentration and dose volume through our peptide dosage calculator guide, then select the size above that covers the full study with margin to spare.
Reconstitution & Handling
When you buy GHRP-2 from PSPeptides, it arrives as a lyophilized powder that must be reconstituted before use. Bacteriostatic water is the standard solvent because its 0.9% benzyl alcohol content keeps the solution usable for weeks under refrigeration. Our guide on what bacteriostatic water is explains why it is preferred over sterile water for multi-dose vials.
Typical volumes: adding 2 mL of bacteriostatic water to a 5mg vial yields 2.5 mg/mL (2,500 mcg/mL); adding 2 mL to a 10mg vial yields 5 mg/mL (5,000 mcg/mL). For finer dose resolution, 10mg vials are often reconstituted with 3–5 mL instead. Swab the stopper, draw your solvent, and inject it slowly down the inside wall of the vial rather than onto the powder. Swirl gently until clear; never shake.
Full step-by-step instructions, including syringe selection and how to calculate draw volumes, are in our guide on how to reconstitute peptides. If you buy GHRP-2 together with bacteriostatic water and other supplies in the same order, everything you need for reconstitution arrives in one shipment.
Storage & Stability
Store unopened lyophilized vials at 2–8°C, protected from light and moisture; under these conditions GHRP-2 remains stable for 24–36 months from the date of manufacture. For long-term archiving, –20°C storage extends shelf life further. Lyophilized peptide tolerates room temperature for the few days it spends in transit, so no cold-chain shipping is required.
After reconstitution with bacteriostatic water, keep the vial refrigerated at 2–8°C and use it within 28 days. Avoid repeated freeze-thaw cycles and minimize the time the vial spends out of the refrigerator. Our peptide storage guide covers best practices in detail, and our article on how to tell if a peptide has degraded explains the warning signs to watch for.
Certificate of Analysis
Every batch of GHRP-2 is analyzed by an independent third-party laboratory using both HPLC for purity and mass spectrometry for identity. The COA reports a purity of 99% or higher and confirms the observed molecular weight against the theoretical value, so you know the vial contains GHRP-2 and not a closely related peptide. The lot number printed on your vial label matches the lot on the COA.
Dual verification matters: HPLC alone can report a high purity figure for the wrong compound, while mass spectrometry alone cannot quantify impurities. Requiring both on every batch is a core quality control step for everyone who chooses to buy GHRP-2 from PSPeptides. To understand each section of the report, our guide to reading a peptide COA walks through HPLC chromatograms, mass spec results, and what acceptable values look like.
Why Researchers Choose PSPeptides
- US Manufactured: Every peptide, including GHRP-2, is produced domestically under strict quality control.
- Third-Party Tested: Independent HPLC and mass spectrometry on every batch, with the COA included.
- Fast Shipping: Free UPS 2nd Day Air on orders over $200, and same-day dispatch on orders placed before 2 PM EST.
- Flexible Payments: Credit cards, Afterpay, Klarna, Apple Pay, and Google Pay, so you can buy GHRP-2 online the way you prefer to pay.
- 7-Day Support: Reach the PSPeptides team by email, phone, or text any day of the week.
How to Buy GHRP-2 Online in Three Steps
- Choose your size. Use the selector at the top of this page to pick the 5mg or 10mg vial and set your quantity.
- Add to cart and check out. Pay with a credit card, Afterpay, Klarna, Apple Pay, or Google Pay. Orders over $200 automatically qualify for free UPS 2nd Day Air.
- Receive your order. Orders placed before 2 PM EST ship the same business day in discreet packaging, with tracking sent to your email.
That is all it takes to buy GHRP-2 from a US manufacturer with third-party testing and a COA in hand before you open the vial.
Bulk and Institutional Orders
Need to buy GHRP-2 in quantity for a multi-arm study or a core facility? Contact the PSPeptides support team by email, phone, or text before you place the order. We can confirm lot availability so an entire study runs on a single batch, provide the COA in advance for your records, and discuss pricing for larger quantities.
Institutional buyers who buy GHRP-2 regularly often set up a standing reorder cadence that matches their protocol schedule, so fresh lyophilized vials arrive before the previous lot is exhausted and reconstituted solutions never sit past their 28-day window.
Popular Research Stacks with GHRP-2
GHRP-2 is rarely studied in isolation. The most common pairing is with a GHRH analog such as CJC-1295 or sermorelin, which produces supra-additive GH release because the two compounds act through different receptors on the same somatotroph. Our CJC-1295 and ipamorelin guide explains the rationale and typical study designs.
Tissue repair researchers often buy GHRP-2 alongside BPC-157 and TB-500, combining systemic GH-axis stimulation with the local angiogenic and cytoprotective mechanisms of those peptides. See the BPC-157 research guide, the TB-500 guide, and the Wolverine stack overview for background.
Metabolic studies may pair it with AOD-9604 for lipolysis work. Washout periods, dosing intervals, and assay selection for multi-compound designs are covered in our peptide stacking guide.
A practical ordering tip: when you buy GHRP-2, adding the companion peptides for your stack to the same cart usually pushes the order past the $200 free-shipping threshold, so the whole protocol arrives together by 2nd Day Air at no extra cost.
GHRP-2 and the GH/IGF-1 Axis
GH released in response to GHRP-2 acts on hepatic and peripheral GH receptors to stimulate IGF-1 production, which drives much of GH’s anabolic signaling: muscle protein synthesis, lipolysis, bone turnover, and immune modulation. Because GHRP-2 can be applied and withdrawn with precision, researchers who buy GHRP-2 gain an on/off lever for the axis that exogenous GH cannot provide.
Timing is a critical experimental variable. GH release is pulsatile, so protocols generally time GHRP-2 administration to coincide with low endogenous GH to maximize the measured peak above baseline. The five-day subcutaneous study cited above shows that daily dosing can attenuate the response, which argues for intermittent schedules and washout periods. Our peptide half-life chart and our article on whether you need to cycle peptides are useful planning references.
For a broader picture of how GH-axis peptides fit into recovery and body-composition research, see our overviews of peptides for muscle growth and recovery and the best peptides for longevity research.
Frequently Asked Questions
How fast will my order ship after I buy GHRP-2?
Orders placed before 2 PM EST ship the same business day; orders placed later ship the next business day. Free UPS 2nd Day Air applies automatically to orders over $200, and every shipment includes tracking. Lyophilized GHRP-2 is stable at ambient temperature during transit, so simply refrigerate it on arrival.
Is a Certificate of Analysis included when I buy GHRP-2?
Yes. Every batch of GHRP-2 is tested by an independent laboratory using HPLC and mass spectrometry, and the batch-specific COA is included with your order. Match the lot number on your vial to the COA to verify purity (99%+) and identity before use.
Should I buy GHRP-2 in 5mg or 10mg?
Choose 5mg for pilot work, method development, or a single short protocol. Choose 10mg for multi-week studies, larger cohorts, or stacked designs with a GHRH analog; it costs less per milligram and requires fewer reconstitutions. Both sizes are the same 99%+ purity peptide.
Is it legal to buy GHRP-2 in the USA?
GHRP-2 is sold in the United States as a research chemical for laboratory use only. It is not FDA-approved for human or veterinary use, and PSPeptides sells it strictly for in vitro and preclinical research. Our article on the legal status of research peptides in 2026 explains the regulatory framework in detail.
What payment methods can I use to buy GHRP-2?
You can buy GHRP-2 online with all major credit cards, Afterpay, Klarna, Apple Pay, and Google Pay. Afterpay and Klarna let you split the purchase into installments at checkout.
How does GHRP-2 differ from GHRP-6 and ipamorelin?
GHRP-2 delivers the strongest GH pulse of the classic GHRPs with moderate appetite stimulation. GHRP-6 produces a stronger hunger response, while ipamorelin is the most selective, with minimal effects on appetite, cortisol, or prolactin. Researchers who need both potent GH release and ghrelin-receptor activity in one compound typically buy GHRP-2.
Legal and Regulatory Status
In the United States and most other jurisdictions, GHRP-2 is classified as a research chemical when sold for laboratory use. It is not approved by the FDA for clinical or consumer use, and it is not intended, labeled, or sold for human or animal consumption. Everyone who chooses to buy GHRP-2 from PSPeptides is purchasing it for in vitro and preclinical research only.
When you buy GHRP-2 from a domestic supplier, you also gain practical advantages: shorter transit times, no customs delays, and direct access to the manufacturer’s quality documentation. For context on recent regulatory developments, see our coverage of FDA peptide reclassification, and for help evaluating vendors, read our guide on how to choose a research peptide supplier.
Related Resources
All PSPeptides products are sold exclusively for laboratory and research use. Not intended for human consumption.
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