In plain English
GHRP-2 is a six-amino-acid peptide that copies ghrelin’s signal to release growth hormone. It produces one of the strongest growth hormone pulses of any peptide in its class, with a moderate increase in appetite.
What it's used for
- Raising natural growth hormone
- Muscle gain and recovery
- Fat loss and body composition
- Appetite support for people who struggle to eat enough
Benefits
In human studies, GHRP-2 has been shown to produce large, reliable growth hormone pulses, and it is used in Japan as a test of the body’s growth hormone reserve. It also raises IGF-1 with repeated use. Users report better recovery, deeper sleep and a fuller look to muscles, along with a moderate appetite boost.
How it works
In simple terms: GHRP-2 flips the ghrelin switch for growth hormone release, hard.
It binds the ghrelin receptor (GHS-R1a) in the pituitary and hypothalamus, triggering growth hormone release and also boosting the effect of the body’s own GHRH. It raises cortisol and prolactin a little, more than ipamorelin but less than hexarelin.
Development history
- 1990s: Developed from earlier work by Cyril Bowers on growth hormone releasing peptides.
- 2000s: Approved in Japan as a diagnostic agent for growth hormone deficiency.
- Today: A popular, inexpensive growth hormone peptide, usually paired with CJC-1295 or sermorelin.
Typical protocols
These ranges are what users commonly report.
| Use | Dose | Frequency | Notes |
|---|---|---|---|
| Standard | 100–300 mcg (often about 1 mcg per kg) | 1–3 times daily | Empty stomach; often before bed |
| With CJC-1295 (no DAC) | 100 mcg each | 1–3 times daily | Same syringe |
Cycling
Commonly run for 8–12 weeks, then a break of 4 or more weeks.
Administration options
Subcutaneous injection.
Reconstitution and dosing calculator
GHRP-2 usually comes in 5 mg or 10 mg vials and is mixed with 2 mL of bacteriostatic water.
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This tool does arithmetic only. It does not choose a dose or confirm that any substance is right for you. Double-check every result against your syringe and your clinician’s instructions.
Side effects and safety
- Common: increased hunger, flushing, water retention, tingling in the hands and injection-site redness.
- Small rises in cortisol and prolactin.
- Raising growth hormone can affect blood sugar; people with diabetes should be cautious.
- People with active cancer are usually advised to avoid growth hormone-raising peptides.
- Prohibited in competitive sport (WADA).
Common stacks
CJC-1295 (no DAC) or sermorelin: the classic pairing for a bigger pulse.
Storage
Powder: refrigerate. After mixing: refrigerate at 2–8 °C and use within about 4 weeks.
Compare with
- Ipamorelin: gentler, with almost no effect on hunger, cortisol or prolactin.
- GHRP-6: similar strength, much more hunger.
- Hexarelin: strongest, but loses effect quickly.
Frequently asked questions
GHRP-2 or GHRP-6?
Both produce strong pulses. GHRP-6 causes much more hunger, so GHRP-2 suits people who do not want an appetite boost.
GHRP-2 or ipamorelin?
GHRP-2 is stronger; ipamorelin is gentler and cleaner on cortisol and prolactin.
References
- Bowers CY. Growth hormone-releasing peptide (GHRP). Cell Mol Life Sci. 1998;54(12):1316-1329.