GHRP-2 dose range
The amounts people commonly use, from the low end to the high end, with syringe units, schedule and half-life. The 7 published studies are one click away.
Human trials Growth hormone axis Also called Pralmorelin, KP-102, GPA-748
Common use ranges
From user guides and clinic write-ups. No drug label exists, and no study has tested these amounts in people. No drug label. Guides agree on 100 to 300 mcg a shot, 1 to 3 times a day.
- Half-life
- about 35 minutes
- How it is taken
- subcutaneous injection
- How long people use it
- 8 to 12 weeks on, then 4 to 8 weeks off.
- Mixing used for the units
- 5 mg vial + 2 mL water. 1 unit on a U-100 insulin syringe = 25 mcg.
Pick your vial size and how much water you add. The units below change to match.
5 mg vial + 2 mL water: 1 unit = 25 mcg
| Tier | Each dose | Syringe units5 mg vial + 2 mL water | How often | Schedule | Vial lastsat this tier |
|---|---|---|---|---|---|
| Starting [1] | 100 mcg | 4 units 0.04 mL | once a day | 100 mcg once a day before bed | 6+ weeks |
| Typical [2] | 150 mcg | 6 units 0.06 mL | 2x a day | 150 to 200 mcg twice a day, morning fasted and before bed | 16 days |
| Higher [3] | 300 mcg | 12 units 0.12 mL | 3x a day | 200 to 300 mcg 2 to 3 times a day | 5 days |
Sources for these amounts
- Starting: Peptidepedia, GHRP-2 dosage
- Typical: Peptidepedia, GHRP-2 dosage
- Higher: Peptidepedia, GHRP-2 dosage
How long people use it: Peptidepedia, GHRP-2 dosage
Half-life: Pihoker et al 1998, J Clin Endocrinol Metab, phase 1 study in children
Take the GHRP-2 chart with you
Get a one-page printable chart for GHRP-2, with the syringe units for each vial and water mix. We can also email you when a new GHRP-2 study is published.
This page shows what labels, clinics and users report, and what studies gave. It is not medical advice and not a recommendation for anyone. Many of these compounds are not approved for human use. Check your own medicines and lab work with a licensed clinician before using anything.
See the science: 7 published studies
Amounts given to people in studies
How it was given: into a vein in the short tests, by mouth in the one long trial
The injected amount is the same in almost every human study, 1 microgram per kilogram.
Read this first. The 900 micrograms per kilogram was swallowed, not injected, and was given to children short on growth hormone. The 100 micrograms three times a day figure comes from a chart review of 14 men, not a trial.
Every study used for this page
Proof grade: Human trials. Tested in randomized human trials. Amounts are quoted as each study reported them. Where the abstract does not state an amount, the row says so.
| Study | Who was studied | Amount given, as reported | Route | How often | How long | What the authors reported |
|---|---|---|---|---|---|---|
| PMID 9543135Pihoker et al, J Clin Endocrinol Metab 1998 | Human, 10 short-stature children | 1 mcgram/kg | Into a vein, over 1 minute | One time | Single dose, blood taken for 2 hours | Growth hormone rose to about 51 ng/mL, blood half-life 0.55 hours |
| PMID 9612233Moreno-Reyes et al, Am J Physiol 1998 | Human, 7 healthy young men | 1 mcgram/kg | Into a vein, bolus | One time, late at night | Single dose | Growth hormone rose but deep sleep did not change |
| PMID 11004017Wideman et al, Am J Physiol 2000 | Human, 9 men and 9 women | 1 mcgram/kg | Into a vein, bolus | One time per session | Single dose with 30 minutes of exercise | Worked better with arginine than either alone |
| PMID 15001624Veldhuis et al, J Clin Endocrinol Metab 2004 | Human, men | 1 mcgram/kg | Into a vein, bolus | One time | Single dose, fasting | Testosterone first eased the brake growth hormone puts on itself |
| PMID 14513874Mericq et al, J Pediatr Endocrinol Metab 2003 | Human, 10 children short on growth hormone | 900 mcgrams/kg | By mouth | Twice a day | 12 months | 7 of 10 felt hungrier early on, body mass index did not really change |
| PMID 28830317Sigalos et al, Am J Mens Health 2017 | Human, 14 men on testosterone (chart review) | 100 mcgrams, with GHRP-6 100 mcgrams and sermorelin 100 mcgrams | Not in abstract | Three times a day | About 134 days on average | IGF-1 went from about 160 to about 239 ng/mL |
| PMID 8887169Bowers and Granda-Ayala, J Pediatr Endocrinol Metab 1996 | Human, younger and older men and women | Not stated in the abstract | Not in abstract | Not in abstract | 7 to 30 days | Whether the response fades depends on the amount and how often it is given |
How to read the study numbers
- One study, one group. Each figure is what one team chose for its own participants or animals.
- Route matters. An amount given into a vein (IV) is not the same as the same amount under the skin, in the nose or by mouth.
- Animals are not small people. An animal amount is shown as the study gave it. It is not a human amount.
- Short studies. Many studies ran days or weeks. They do not show what happens over longer use.
Common questions
What amounts of GHRP-2 were used in human studies?
In the studies listed here, people were given from 1 microgram per kilogram, one time, into a vein up to 900 micrograms per kilogram by mouth, twice a day for 12 months. The amount used most often was 1 microgram per kilogram, one time, into a vein. These are what study teams chose for their participants under supervision.
Where do these GHRP-2 numbers come from?
From 7 published studies, each linked to its PubMed or ClinicalTrials.gov record. Every figure was checked against the study abstract or its open full text. Proof grade: Human trials.
How long does GHRP-2 stay in the body?
Its half-life is about 35 minutes in people. Half-life is how long it takes for half of a dose to leave the blood. The effect can last longer than that.
Is this a recommendation for how much GHRP-2 to use?
No. This page shows the amounts reported by drug labels, clinics and users, next to what researchers gave in studies. It is not medical advice and not a recommendation for anyone. Talk to a licensed clinician before using any of it.