GHRP-6

Growth Hormone Releasing Peptide 6 · His-DTrp-Ala-Trp-DPhe-Lys-NH2

Research Use Only

The 'hungry' GH peptide — potent growth hormone release paired with intense appetite stimulation. Popular but messy.

Growth Hormone PeptideEvidence: ★★★☆☆

Educational content only. Not medical advice. This compound may be regulated in your jurisdiction. Consult a healthcare professional.

01 What is GHRP-6?

GHRP-6 was one of the first synthetic growth hormone releasing peptides developed, and it remains popular despite newer, 'cleaner' alternatives existing. It works through the ghrelin receptor to stimulate GH release — but unlike the more selective Ipamorelin, GHRP-6 activates the ghrelin system broadly. The result: significant GH release but also intense hunger, cortisol elevation, and prolactin increase. The hunger effect is not subtle. Within 20 minutes of injection, most users experience ravenous appetite — the kind where you could eat an entire pizza and still want more. For bodybuilders trying to bulk, this is a feature not a bug. For people trying to lose body fat, it is a significant problem. This appetite effect has made GHRP-6 popular in bodybuilding 'bulking' phases where eating enough is the challenge. GHRP-6 also has interesting gastro-protective effects similar to BPC-157 — it protects gastric mucosa and may promote gut healing. This is sometimes overlooked because people focus on the GH and appetite effects, but it is a genuine secondary benefit for those with gut issues.

02 How Does It Work?

GHRP-6 binds GHS-R1a (ghrelin receptor) with moderate selectivity, triggering: 1. Pituitary GH release — significant acute spike (less than Hexarelin, more than Ipamorelin). 2. Ghrelin-mimetic effects — potent appetite stimulation, gastric motility increase. 3. Cortisol release — moderate elevation (more than Ipamorelin or GHRP-2). 4. Prolactin release — moderate elevation. 5. Gastric protection — cytoprotective effect on stomach lining, possibly via nitric oxide pathways. The 'messiness' comes from hitting multiple downstream pathways. Ghrelin receptors are expressed widely, so broad activation produces multiple effects beyond GH release.

03 What Does The Research Say?

Evidence Quality:★★★☆☆

Moderate evidence. Some human data, mostly animal studies.

GH release: Well-characterised in numerous studies. Produces reliable GH elevation of 3-5x baseline. Synergises powerfully with GHRH analogues (combination produces greater response than either alone). Gastric protection: Multiple studies showing gastroprotective effects against ethanol, NSAIDs, and stress-induced gastric damage. Comparable to some effects of BPC-157. Body composition: Limited clinical data specifically for body composition. Most evidence comes from bodybuilding community reports and extrapolation from GH physiology. Desensitisation: Less than Hexarelin but still occurs with chronic daily use. Most practitioners recommend cycling.

04 Reported Dosages

Research literature dosages only. NOT medical recommendations. Always consult a healthcare professional.

Subcutaneous: 100-300mcg 2-3 times daily (before meals or before bed). Most common: 100mcg three times daily. Best on completely empty stomach (any food blunts GH response). Often combined with a GHRH (CJC-1295 or Mod GRF 1-29) for synergistic GH release. Cycle: 8-12 weeks on, 4 weeks off. DISCLAIMER: Research peptide — not approved for human use. The appetite stimulation is intense and can derail fat loss goals. Not suitable if you struggle with overeating.

05 Side Effects & Risks

Intense hunger (20-30 minutes post-injection, lasting 1-2 hours), water retention, tingling/numbness, cortisol elevation (can disrupt sleep if dosed too late), prolactin elevation (monitor with chronic use). Some users report blood sugar drops (hypoglycaemia-like symptoms) from the insulin response to ghrelin activation. Compared to Ipamorelin: more side effects, messier hormone profile, but stronger GH response and unique gut-healing properties.