GHRP-6 Dosage and the Hunger Effect

Key takeaways

• There is no approved GHRP-6 dose. Human studies used single intravenous doses of 0.1 to 1 mcg/kg (about 7 to 70 mcg for a 70 kg adult), four 50 mcg doses in one night, and oral doses of 100 to 300 mcg/kg.
• 1 mcg/kg intravenously released a large growth hormone (GH) pulse and also about doubled prolactin and cortisol. No published study tested repeated daily injections for weeks.
• Seller charts of 100 to 300 mcg two or three times a day, fasted, for 8 to 12 weeks are claims from sellers and forums, not a studied regimen.
• The hunger effect is GHRP-6's reputation, but we found no human trial that measured it. The measured human data come from GHRP-2, which raised food intake by about 36%, and from ghrelin itself.
• No US pharmacy may compound GHRP-6, so this page has no mixing or units table.

The direct answer: GHRP-6 was studied in people at 0.1 to 1 mcg/kg intravenously, about 7 to 70 mcg for a 70 kg adult, as single doses that measured hormones for a few hours. The "100 to 300 mcg, two or three times a day" in seller charts sits just above that range and has never been tested as a schedule. Our GHRP-2 and GHRP-6 profile covers the evidence, side effects and legal status in full; the GHRP-2 vs ipamorelin comparison covers the newer alternatives.

Every studied GHRP-6 dose

Two things in that table matter most.

The effective dose is small. In the 1990 dose-response study, GH output climbed steeply from 0.1 to 1 mcg/kg (Bowers 1990). A 100 mcg injection is about 1.4 mcg/kg for a 70 kg adult, already at the top of the studied intravenous range, though an injection under the skin is absorbed more slowly than an intravenous bolus. Seller doses of 200 to 300 mcg two or three times a day go beyond the doses tested for GH release; only the drug-level study, which measured blood levels rather than effects, used more. No study shows that more peptide buys more effect. The same 1 mcg/kg dose was the first at which prolactin and cortisol rose.

Route and timing changed everything. Oral GHRP-6 worked in fasting men in the morning (Bowers 1992), but the same 300 mcg/kg in enteric-coated capsules taken at 9 p.m. raised neither GH nor cortisol (Frieboes 1999). A nasal dose of 30 mcg/kg raised GH through the night. The authors concluded the effects "depend upon dosage, duration and route of administration", which is another way of saying no one has worked out a regimen.

The two half-lives in the literature disagree. The 1992 study, using an antibody test, found GHRP-6 left the blood with a half-life of about 20 minutes (Bowers 1992); a 2013 study using mass spectrometry, at doses up to 400 mcg/kg, found an elimination half-life of about 2.5 hours (Cabrales 2013). The GH pulse itself is short either way.

The seller charts

The seller figures come from a supplement-seller guide summarized in a 2026 review of self-administered GH-axis peptides: 100 to 300 mcg under the skin or into muscle, two or three times a day, fasted "to avoid insulin-mediated GH inhibition", in cycles of 8 to 12 weeks (Dominikowski 2026). The same review's own column of studied doses lists the 1 mcg/kg intravenous bolus and the 300 mcg/kg oral dose in children, both single administrations. Nothing in the published human record tests weeks of repeated injections.

The fasting advice has a real basis: food and insulin blunt GH release. It is also the instruction most likely to collide with the hunger effect.

The hunger effect: what is known

GHRP-6 activates the ghrelin receptor, and ghrelin is the hormone that makes you hungry before a meal. That is the source of GHRP-6's reputation as a "bulking" peptide. The evidence behind it, sorted honestly:

So the hunger effect is plausible, consistent with users' reports and with GHRP-2's measured effect, and unmeasured for GHRP-6 itself. Nobody knows how strong it is at seller doses, how quickly it starts, or whether it fades with repeated use. In children given oral GHRP-2 twice daily for a year, the reported appetite increase was concentrated in the first six months, and body mass index did not change significantly, as our GHRP-2 and GHRP-6 profile details.

For anyone trying to lose fat, the hunger works against the goal. For anyone with an eating disorder, it is a reason not to touch the peptide.

Why there is no mixing table here

We give units tables and reconstitution examples only for products a US pharmacy can legally dispense. GHRP-6 is not one of them: it was never approved, sits in Category 3 for 503A pharmacies, and has been on the Category 2 safety list for outsourcing facilities since September 2023, as our legal tracker records. Every vial sold is a research product of unverified content, and FDA's 2026 warning letters treated research peptides sold with dosing guides and bacteriostatic water as unapproved drugs. Our reconstitution calculator and units guide are built for dispensed medications with a labeled concentration.

If the goal is a monitored rise in GH, the secretagogue a licensed pharmacy can dispense is sermorelin; its dosage chart does include a units table, because a pharmacy label exists to check it against.

Bottom line

GHRP-6 was studied at 0.1 to 1 mcg/kg intravenously and at much larger oral doses, as single doses that measured hormones for hours. The seller schedule of 100 to 300 mcg two or three times a day has never been tested, and the 1 mcg/kg dose that gives a large GH pulse is also the one that raises prolactin and cortisol. The hunger is probably real, but in humans it has been measured only for GHRP-2 and ghrelin. No US pharmacy may make GHRP-6, so any dose you read about is a dose of an unverified research vial.

Frequently asked questions

+−What is the GHRP-6 dosage per day?

There is no approved or validated daily dose. Human studies used single intravenous doses of 0.1 to 1 mcg per kilogram, four 50 mcg doses during one night, and single oral doses of 100 to 300 mcg per kilogram. No published study gave GHRP-6 injections two or three times a day for weeks. The 100 to 300 mcg two or three times daily in seller charts comes from sellers and forums.

+−How much GHRP-6 should I take?

We do not recommend any amount, and no clinician can prescribe a legal product: GHRP-6 is not FDA-approved and no US pharmacy may compound it. What the studies show is that 1 mcg per kilogram intravenously, about 70 mcg for a 70 kg adult, already releases a large growth hormone pulse, and that this dose also roughly doubled prolactin and cortisol.

+−How long after GHRP-6 do you get hungry?

No human study has measured it. The best human data come from GHRP-2, a close relative: men given a continuous infusion under the skin ate about 36 percent more at a buffet at the end of a 270-minute infusion. That study did not test how soon hunger begins after a single injection, and no study has done so for GHRP-6. Seller and forum timings are reports, not measurements.

+−Should GHRP-6 be taken on an empty stomach?

The studies that showed the largest growth hormone responses gave it fasting, and food and insulin blunt growth hormone release, which is why diagnostic tests are done after an overnight fast. In one study, an enteric-coated oral dose taken in the evening raised neither growth hormone nor cortisol. Fasting does not make it safe or legal; it only explains why seller charts say 'fasted'.

+−Does GHRP-6 work orally?

Yes, weakly. Oral doses of 300 mcg per kilogram, about 21 mg for a 70 kg adult, released about as much growth hormone in fasting men as 1 mcg per kilogram intravenously, roughly 0.3 percent of the activity. The same oral dose in enteric-coated capsules taken at night did nothing measurable. Capsules sold today have no verified content.

+−How do you reconstitute GHRP-6?

We do not give reconstitution instructions or a units table for GHRP-6. No licensed pharmacy may make it, so every vial is a research product with unverified content and sterility, and FDA's 2026 warning letters cited reconstitution guides and bundled bacteriostatic water as evidence that research peptides were being sold as drugs.

+−Is GHRP-6 good for sleep?

Not in the way GHRH analogs are said to be. Four night-time doses of 50 mcg in healthy men increased light stage 2 sleep by about 25 minutes, did not change deep slow-wave sleep, and more than doubled cortisol in the first half of the night.

Sources

1. StudyBowers CY et al. Growth hormone (GH)-releasing peptide stimulates GH release in normal men and acts synergistically with GH-releasing hormone. J Clin Endocrinol Metab 1990;70:975-82. (1990)
2. StudyBowers CY, Alster DK, Frentz JM. The growth hormone-releasing activity of a synthetic hexapeptide in normal men and short statured children after oral administration. J Clin Endocrinol Metab 1992;74:292-8. (1992)
3. StudyFrieboes RM et al. Growth hormone-releasing peptide-6 stimulates sleep, growth hormone, ACTH and cortisol release in normal man. Neuroendocrinology 1995;61:584-9. (1995)
4. StudyFrieboes RM et al. Effects of growth hormone-releasing peptide-6 on the nocturnal secretion of GH, ACTH and cortisol and on the sleep EEG in man: role of routes of administration. J Neuroendocrinol 1999;11:473-8. (1999)
5. StudyPopovic V et al. GH-releasing hormone and GH-releasing peptide-6 for diagnostic testing in GH-deficient adults. Lancet 2000;356:1137-42. (2000)
6. StudyLaferrère B et al. Growth hormone releasing peptide-2 (GHRP-2), like ghrelin, increases food intake in healthy men. J Clin Endocrinol Metab 2005;90:611-4. (2005)
7. StudyCabrales A et al. Pharmacokinetic study of growth hormone-releasing peptide 6 (GHRP-6) in nine male healthy volunteers. Eur J Pharm Sci 2013;48:40-6. (2013)
8. ReviewDominikowski A et al. The emerging landscape of performance-enhancing peptides modulating GH-IGF1 axis: bridging the gap between clinical evidence and patient self-administration. Front Endocrinol (Lausanne) 2026;17:1822475. (2026)