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Ipamorelin vs GHRP-6

Side-by-side comparison of evidence, mechanisms, dosing, safety, and regulatory status.

Ipamorelin: DGHRP-6: D
AttributeIpamorelinGHRP-6
CategoryGrowth Hormone SecretagogueGrowth Hormone Secretagogue
Evidence RatingD — PreclinicalD — Preclinical
Clinical StatusResearch-only / Not approved for human useResearch-only / Not approved for human use
MechanismIpamorelin (sequence: Aib-His-D-2Nal-D-Phe-Lys-NH2) selectively binds to the Growth Hormone Secretagogue Receptor (GHS-R1a) on anterior pituitary somatotroph cells, increasing cAMP and activating protein kinase A to promote pulsatile GH secretion. Its structural specificity means it fits only the GH...GHRP-6 functions as a synthetic ghrelin mimetic by binding to GHS-R1a in the pituitary and hypothalamus, triggering pulsatile GH release and raising IGF-1 levels. Unlike continuous GH administration, GHRP-6 maintains physiological feedback: as GH and IGF-1 rise, endogenous somatostatin increases to ...
Half-Life~2 hours~15–60 minutes
BioavailabilityHigh SC bioavailability—
Molecular Weight~711.9 g/mol~873.0 g/mol
WADA StatusProhibitedProhibited
Dosing100–300 mcg per injection, 2–3x daily, 2–3 times daily (typically before meals and before bed) (Subcutaneous)100–300 mcg per injection, 2–3x daily (saturation dose ~1 mcg/kg), 2–3 times daily (Subcutaneous)
Key Use Cases
  • Anti-Aging
  • Body Composition
  • Sleep
  • Body Composition
Safety Concerns
  • Widely regarded as the mildest GHS available; minimal side effects in published animal and human studies
  • Common: injection site reactions (redness, swelling, bruising) in 15-30% of users, resolving within 24-48 hours
  • Common: mild temporary "head rush" or flushing immediately after injection due to sudden vasodilation
  • Intense hunger due to ghrelin receptor activation (more pronounced than other GH secretagogues)
  • Transient mild increases in cortisol and ACTH (typically not clinically significant)
  • Water retention and bloating reported
Contraindications
  • Active malignancy or personal/family history of cancer (GH promotes cell proliferation)
  • Pregnancy and breastfeeding
  • Pituitary disorders or prior pituitary surgery
  • Diabetes with retinopathy (GH can affect blood glucose and worsen retinopathy)
  • Active malignancy (GH/IGF-1 elevation contraindicated)
  • Pregnancy and breastfeeding
  • Pituitary disorders
  • Conditions worsened by increased appetite, cortisol, or fluid retention
Regulatory (US)Not FDA-approved. Research chemical only. WADA-banned (S2 growth factor).Not FDA-approved. Research chemical only.

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Research Disclaimer: This comparison is provided for educational purposes only. All products are sold exclusively for in vitro research use. The information presented is based on published preclinical and clinical research and does not constitute medical advice. Consult a qualified healthcare professional before making any decisions regarding peptide use.

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