Peptide Decoding
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Decoding

GHRP-2_

Also known as pralmorelin, KP-102

A shot that spikes your own growth hormone to build muscle and recover.

Muscle & recoveryGH secretagogue (GHRP)Research only
InGrowth hormone peptides
Common vial size5 mg
Dose0.1 up to 0.3 mg per dose (start low, increase slowly)
Frequency1-3x daily
RouteUnder the skin (subcutaneous)
StatusResearch only
MixYour choice, calculate it
CycledCommonly cycled, usually 8 to 12 weeks on and 4 off

Common vial size is what vendors typically sell, not a recommendation. Enter your own vial in the calculator.

01

What is GHRP-2?

Plain language first. The technical label stays, but it never stands alone.

Overview

GHRP-2 is a growth hormone releasing peptide (a ghrelin-receptor agonist). In plain terms: it signals a strong pulse of your own growth hormone, a bigger boost than ipamorelin, though it also nudges appetite and stress hormones up a bit.

What it's used for

A shot that spikes your own growth hormone to help build muscle, recover, and lean out. It gives a bigger boost than ipamorelin but can raise hunger.

02

How does GHRP-2 work?

What it does in the body, and where.

GHRP-2 works on the same receptor as ipamorelin but hits it harder and less selectively.

  1. 01
    It activates the ghrelin receptor
    Triggering a growth hormone pulse from the pituitary.
  2. 02
    The pulse is larger than ipamorelin's
    Which is the reason people choose it.
  3. 03
    Cortisol and prolactin rise too
    Ipamorelin was designed specifically to avoid this. GHRP-2 trades that selectivity for strength.
Pathway
THE PEPTIDEGHRP-2ACTS ONThe ghrelin receptorRESULTStrong growth hormo…RESULTProlactin and corti…

A schematic of the compound's mechanism, not a diagnostic image.

03

What else is it used for?

Each use below carries its own evidence level. Approved means regulators have cleared it for that purpose. Investigational means it is in trials. Early research means it is being studied and is not established.

  • Raising growth hormone to build muscle and recoverResearch only
  • Increased appetiteResearch only
04

How much, and do you cycle it?

The range, and whether you take breaks.

0.1 up to 0.3 mg per dose (start low, increase slowly), 1-3x daily. Commonly cycled, usually 8 to 12 weeks on and 4 offCommunity practice

Continuous exposure to a ghrelin-receptor peptide blunts the growth hormone response to a later dose of the same peptide. That is documented in people. The particular on/off schedules quoted for GHRP-2 are not: no study has compared one against another.

Source: 24-hour GHRP infusion attenuates the response to a later GHRP bolus (J Clin Endocrinol Metab, 1993)

Compare cycling across compounds →

05

How do I dose and price it?

Enter your vial and your dose. Pick a mix. We show the draw and the cost.

The vial holds a fixed amount of drug. Adding more water does not make more drug, it just spreads it thinner, so you draw a bigger number on the syringe for the same dose.

Your vial size (mg)
Printed on the vial.
What you paid per vial
$
Used for cost per dose only.
Your dose (mcg)
Commonly referenced range: 0.1 up to 0.3 mg per dose (start low, increase slowly)Community practice

Choose your mix

your own mL
units · —
Enter your own volume

Measuring the water1 mL = one full 100-unit syringe.

Your draw

4 / 100 units
4 units is a very small line to read, so a small slip is a large error. A larger water volume above spreads the same dose across more units.
Full calculator with reorder date →Read a syringe →
06

How do you store it?

Before mixing, and after.

Dry powder in the freezer or fridge. Once mixed, fridge, and use within about a month.

Unmixed lyophilized GHRP-2 keeps for a long time cold. Once you add water the clock starts: most reconstituted vials hold up for roughly 28 to 30 days at fridge temperature. Keep it out of light, and do not freeze it after mixing.

07

What are the side effects and cautions?

Known cautions and warnings for this compound.
Handling note

Can cause a histamine flush: temporary flushing, itching, or welts near the injection, usually mild and short-lived. Injecting slowly helps. If it spreads, or you get facial or throat swelling or trouble breathing, treat it as a reaction and get help immediately.

Community notes: what actually helps

What actually helps, according to the people doing it

Nobody's running trials on this. What follows is the folk wisdom that keeps surfacing in Reddit, peptide forums, and the Discord groups, sorted from "probably real" to "someone swears by it." Keep in mind, NONE of this is doctor advice.

Change how you inject (this helps most people)

The tip that comes up most on r/peptides is to add more water. Mix your vial with 3 or 4mL of bac water instead of 1 to 2mL. Same dose, spread thinner, so your skin reacts less.

Small habits people swear by
  • Let it warm to room temperature. Cold stings more.
  • Let the alcohol dry fully before the needle goes in.
  • Inject slow, over five to ten seconds.
  • Move your spot around, at least an inch from last time.
  • For a hard lump, warm compress after. For a red itchy welt, ice.
Treat the itch

This is where Benadryl and Zyrtec come up constantly on the boards. Most people take one 30 to 60 minutes before the shot if they know they tend to react. Claritin works too. Some skip the pill and use Benadryl cream before, or hydrocortisone cream after. Quercetin gets mentioned a lot as the gentler, natural option.

One heads up you'll also see repeated: taking an allergy pill before every shot can hide a real allergy building underneath. That's why some people don't do it by default.

The deeper end

In the more advanced threads, people keep KPV around and inject it when a reaction flares, and say it clears fast. Others try low-dose naltrexone (LDN) as a longer-term fix, but that's real experimenter territory. And a common reminder on the forums: if your reactions are suddenly bad or started with a new vial, the peptide itself might be the problem, not you.

When to stop and get help

Redness that spreads past a couple inches, streaks, feels hot, oozes, or comes with a fever means a possible infection. See a doctor. Hives all over, a swollen face or throat, or trouble breathing is a real allergic reaction. Act on that right away.

Who should avoid it

Check these before anything else.
  • Active cancer
  • Pregnancy
  • Banned in drug-tested sport

Stop and get help

These are emergencies. Seek care.
  • Signs of an allergic reaction
  • Persistent milky nipple discharge, which can indicate raised prolactin

Common effects

Expected, and usually mild.
  • Increased hunger
  • Water retention
  • Tiredness after dosing
  • Raised prolactin and cortisol at higher doses
  • Tingling in the hands

Where this page says nothing is established, that means nobody has studied it, not that a compound is safe.

08

Is GHRP-2 approved?

And where the numbers on this page come from.
Research only

No. Not FDA-approved.

Sold for research use only. Not cleared for human consumption or medical use.

  • DoseFrom research and community reports. No regulator has reviewed this dose.
  • Vial sizeFrom what vendors typically list; not a recommendation.
  • Reviewed22 July 2026
09

What else is like GHRP-2?

Others in Growth hormone, side by side.

If you're weighing GHRP-2, it's worth reading Ipamorelin, CJC-1295 with DAC, and CJC-1295 no DAC (Mod GRF 1-29) in the same class.

YOU ARE HERE
GHRP-2

A shot that spikes your own growth hormone to build muscle and recover.

Research only
Dose
0.1 up to 0.3 mg per dose (start low, increase slowly)
How often
1-3x daily
Ipamorelin

A gentle shot that nudges your body to release its own growth hormone.

Research only
Dose
0.2 up to 0.3 mg per dose (start low, increase slowly)
How often
Daily, often at night
CJC-1295 with DAC

A once-or-twice-weekly shot that keeps your growth hormone raised for days.

Research only
Dose
1 up to 2 mg per dose (start low, increase slowly)
How often
1-2x per week
CJC-1295 no DAC (Mod GRF 1-29)

A short-acting growth-hormone pulse, usually paired with ipamorelin.

Research only
Dose
0.1 mg per dose
How often
Daily to 2x daily
Compare growth hormone peptides
10

What these words mean

Show glossary +
Titrate
Starting at a low dose and increasing it slowly over time so your body adjusts and side effects stay mild.
Subcutaneous
An injection just under the skin, into the fat layer, usually with a short, thin insulin needle.
Intramuscular (IM)
An injection into a muscle, using a longer needle.
Reconstitution
Mixing a powdered peptide with liquid (bacteriostatic water) so it can be drawn into a syringe.
Bacteriostatic water
Sterile water with a tiny amount of preservative, used to mix powdered peptides.
Concentration
How strong the mixed peptide is, in milligrams per milliliter (mg/mL). More water makes it weaker; less water makes it stronger.
Units (on the syringe)
The marks on an insulin syringe. 100 units equals 1 mL. They measure how much liquid you draw, not the dose in milligrams.
mcg and mg
Units of dose. 1 milligram (mg) equals 1,000 micrograms (mcg).
GLP-1
A natural gut hormone that lowers appetite and blood sugar. Drugs that copy it, like semaglutide, are used for weight loss.
Growth hormone secretagogue
A compound that nudges your body to release more of its own growth hormone, rather than injecting the hormone itself.
Half-life
How long a compound stays active in your body. A longer half-life means you inject less often.
Peptide vs small molecule
A peptide is a short chain of amino acids. A few items here (like MK-677 or methylene blue) are small molecules, not true peptides, but people use them the same way.
Research only
No approved dose or use in people. Sold for research and not reviewed by the FDA for safety or quality.
Investigational
Still being tested in clinical trials and not yet approved or legally sold for general use.
Banned in drug-tested sport
Prohibited by the World Anti-Doping Agency (WADA); using it can disqualify a competing athlete.

Last reviewed 22 July 2026