Ipamorelin is a synthetic five-amino-acid peptide investigated as a selective growth hormone secretagogue. It acts at the ghrelin receptor rather than supplying growth hormone directly. The page reviews research on hormone release, body composition and recovery, with receptor selectivity providing the context for comparison with earlier growth hormone-releasing peptides.
Ipamorelin is a synthetic pentapeptide and selective GH secretagogue — a ghrelin/GHSR-1a receptor agonist engineered for selectivity that produces clean, physiological GH pulses without the side effects of cortisol, prolactin, or acetylcholine elevation that limit earlier GHRPs. It is widely considered the most selective and well-tolerated member of the GHRP family for chronic research administration.
Ipamorelin is a synthetic pentapeptide and selective GH secretagogue — a ghrelin/GHSR-1a receptor agonist engineered for selectivity that produces clean, physiological GH pulses without the side effects of cortisol, prolactin, or acetylcholine elevation that limit earlier GHRPs. It is widely considered the most selective and well-tolerated member of the GHRP family for chronic research administration.
Selectivity Advantage
Earlier GHRPs produce side effects through off-target receptor activation: GHRP-6 produces pronounced hunger stimulation; GHRP-2 elevates cortisol and prolactin; Hexarelin produces the most robust GH pulse but fastest receptor desensitization. Ipamorelin was specifically engineered to avoid these off-target effects — producing GH pulses with minimal cortisol, prolactin, or appetite effects, even at doses producing maximal GH release.
Research Applications
Ipamorelin produces GH pulses that closely mimic natural physiology — a sharp rise to peak within 15 minutes, returning toward baseline within 2–3 hours. It is frequently combined with GHRH analogs (CJC-1295 no DAC, Sermorelin) for synergistic GH release. Research applications include GH restoration protocols, body composition optimization, recovery from injury and surgery, sleep quality improvement, and anti-aging applications.
Quick Reference
Member reference tables summarize the compound's research parameters.
Stimulates pituitary gland to release growth hormone naturally with consistent elevation 30-60 minutes post-injection, maintaining healthy pulsatile patterns.
IGF-1 Enhancement
Increases insulin-like growth factor-1 production through natural GH pathways, mediating growth hormone's beneficial effects on muscle, bone, and tissue.
Anti-Aging Benefits
Supports cellular regeneration, collagen synthesis, and metabolic function through enhanced growth hormone pathways without disrupting natural hormone balance.
Body Composition
Preliminary Data
Lean Muscle Development
Promotes muscle protein synthesis and nitrogen retention when combined with resistance training, leading to increased lean mass over 12-16 weeks.
Fat Loss Support
Enhances lipolysis and metabolic rate through GH-mediated pathways, improving overall body composition and reducing visceral fat accumulation.
Body Recomposition
Improves overall body composition with simultaneous increase in lean mass and reduction in fat mass, particularly effective for aging populations.
Recovery
Supported Research
Sleep Enhancement
Increases slow-wave sleep duration and quality when taken before bed, leading to more restorative sleep and improved morning energy levels.
Exercise Recovery
Accelerates recovery from exercise-induced muscle damage with reduced soreness, faster performance restoration, and enhanced training adaptations.
Tissue Repair
Supports tissue repair and cellular regeneration during sleep through enhanced growth hormone release and improved recovery processes.
Research Protocols
As reported in cited literature and research-community logs (see Research Citations below), not a personal dosing recommendation.
This member section describes parameters reported in the research literature.
Included for harm-reduction awareness only, in the event this compound is encountered outside its labeled research use. Inclusion here does not imply RUO Codes endorses, recommends, or instructs human use.
This member section discusses research safety considerations and uncertainties.