GHRP-6 dose range
The amounts people commonly use, from the low end to the high end, with syringe units, schedule and half-life. The 8 published studies are one click away.
Small human studies Growth hormone axis Also called Growth hormone releasing peptide 6, SK&F 110679
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. Only one comparison guide gives amounts: 100 to 300 mcg a shot, 2 to 3 times a day.
Sources disagree, or there are very few. The amounts below come from a small number of guides, and they do not line up well. Treat every number on this page as uncertain, and check each source yourself.
- Half-life
- about 2.5 hours
- How it is taken
- subcutaneous injection
- How long people use it
- Not stated by the source.
- 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 | 2x a day | 100 mcg 2 times a day | about 4 weeks |
| Typical [2] | 100 mcg | 4 units 0.04 mL | 3x a day | 100 mcg 3 times a day: morning, after a workout, 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 |
Good to know
- GHRP-6 raises hunger more than GHRP-2. Some take it before meals for that reason.
Sources for these amounts
- Starting: Peptide-DB, GHRP-6 vs hexarelin
- Typical: Peptide-DB, GHRP-6 vs hexarelin
- Higher: Peptide-DB, GHRP-6 vs hexarelin
Half-life: Cabrales et al 2013, Eur J Pharm Sci, pharmacokinetic study in nine healthy men
Take the GHRP-6 chart with you
Get a one-page printable chart for GHRP-6, with the syringe units for each vial and water mix. We can also email you when a new GHRP-6 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: 8 published studies
Amounts given to people in studies
How it was given: into a vein
The 90 to 100 microgram amounts are flat, not per kilogram.
Amounts given to animals in studies
Read this first. Nearly every human amount is a one-time pituitary test, not repeated use. The only repeated-use human figure, 100 micrograms three times a day, is from a 14-man chart review.
Every study used for this page
Proof grade: Small human studies. Only small or uncontrolled human studies. 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 23099431Cabrales et al, Eur J Pharm Sci 2013 | Human, 9 healthy men | 100, 200 and 400 mcgrams/kg | Into a vein, bolus | One time per dose level | Single doses, blood taken 12 hours | Clearing half of it took 2.5 hours, spread phase 7.6 minutes |
| PMID 8435889Peñalva et al, Clin Endocrinol 1993 | Human, men plus 9 women | 1 mcgram/kg | Into a vein | One time at minute 0 | Single dose | Growth hormone rose, not changed by sex or by alpha and beta blockers |
| PMID 7883854Popovic et al, J Clin Endocrinol Metab 1995 | Human, 12 patients with a cut pituitary stalk and 11 controls | 90 mcgrams | Into a vein | One time per test | 3 separate test days | Response was fully blocked when the stalk was cut, so it works mostly in the hypothalamus |
| PMID 15817913Haijma et al, Eur J Endocrinol 2005 | Human, 10 elderly men, 9 obese men, 7 controls | 93 mcgrams, with GHRH 100 mcgrams | Into a vein, bolus | One time | Single test, 2 hours of sampling | Response was much lower in severely obese men, so the usual cut-off does not fit them |
| PMID 28830317Sigalos et al, Am J Mens Health 2017 | Human, 14 men on testosterone (chart review) | 100 mcgrams, with GHRP-2 100 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 41901314Wang et al, Pharmaceuticals 2026 | Rat, heart attack model (coronary artery tied off) | 0.4 mg/kg, called the lowest amount that worked | Not in abstract | Not in abstract | 7 days | Less heart scarring and better pumping after the heart attack |
| PMID 15890336Depoortere et al, Eur J Pharmacol 2005 | Rat | 10 to 150 mcgrams/kg | Into the belly | One time | Single dose | Sped up stomach emptying, like ghrelin and motilin |
| PMID 38873418Berlanga-Acosta et al, Front Pharmacol 2024 | Rat, doxorubicin-treated | Not stated in the abstract | Not in abstract | Given alongside doxorubicin | Not in abstract | Stopped the heart from stretching out and kept pumping normal |
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-6 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 400 micrograms per kilogram, one time, into a vein. The amount used most often was 90 to 100 micrograms, one time, into a vein. These are what study teams chose for their participants under supervision.
Where do these GHRP-6 numbers come from?
From 8 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: Small human studies.
How long does GHRP-6 stay in the body?
Its half-life is about 2.5 hours 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-6 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.