Ipamorelin is a synthetic pentapeptide and selective growth hormone releasing peptide (GHRP) that stimulates the pituitary to release growth hormone in a pulsatile, physiologically consistent manner.
Preclinical research identifies the ipamorelin peptide as the first GHRP to produce a clean GH release profile with minimal impact on cortisol, ACTH, and prolactin, a characteristic that separates it from earlier secretagogues. Ipamorelin is frequently studied alongside CJC 1295, with the CJC-1295 ipamorelin combination shown to produce a synergistic GH pulse through simultaneous activation of complementary receptor pathways.
Ipamorelin must be reconstituted with bacteriostatic water before use in research applications.
Size / Amount:
CAS: 170851-70-4
Sequence: Aib-His-D-2-Nal-D-Phe-Lys-NH2
Molecular Formula: C38H49N9O5
Molecular Weight: 711.85 Da
Purity: 99%+ (verified by HPLC)
Appearance: White to off-white lyophilized powder
Form: Lyophilized (freeze-dried)
Classification: Growth Hormone Releasing Peptide (GHRP), Ghrelin Mimetic
Ipamorelin vials must be stored in a cool, dry place away from direct sunlight. Unreconstituted ipamorelin peptide should be kept at -20°C for long-term storage or 2-8°C for short-term storage. Once reconstituted with bacteriostatic water, ipamorelin should be refrigerated at 2-8°C and used within 28-30 days for optimal stability. CJC-1295/ipamorelin storage temperature post-reconstitution follows the same standard: 2-8°C. Do not freeze reconstituted solutions. Always follow proper storage guidelines to maintain product integrity for research applications.
Ipamorelin is freely soluble in bacteriostatic water and sterile saline. Gently swirl the vial after adding solvent. Do not vortex or shake vigorously, as this may damage the peptide structure.
Ipamorelin is intended for research purposes only and is not approved for human use.
Ipamorelin dosage per day used in preclinical research typically ranges from 1 to 10 micrograms per kilogram of body weight, administered once or twice daily. Ipamorelin has a short plasma half-life of approximately 2 hours, which shapes ipamorelin dosing protocols designed to replicate pulsatile GH secretion patterns. Common protocols in published literature include:
Ipamorelin dosage and timing in research protocols often aligns administration with periods of fasting or rest cycles to maximize GH pulse amplitude, consistent with the natural relationship between feeding state and GH secretion dynamics.
Ipamorelin is supplied as a lyophilized (freeze-dried) powder to ensure stability during transport and storage. For research use, the peptide must be reconstituted using bacteriostatic water or sterile saline. Introduce the solvent slowly down the inside wall of the vial and gently swirl to dissolve. Do not shake or vortex the solution. CJC-1295/ipamorelin storage temperature post-reconstitution should be maintained at 2-8°C and used within 28-30 days for optimal peptide stability. Unreconstituted ipamorelin peptide should be kept at -20°C for long-term storage. When combining in a CJC 1295 ipamorelin bacteriostatic water mix, maintain the same storage and handling standards for both peptides.
Raun et al. characterized ipamorelin as the first GHRP to demonstrate a highly selective growth hormone release profile. In rat studies, ipamorelin produced a dose-dependent GH pulse comparable in magnitude to GHRP-6 and GHRP-2 while producing no statistically significant elevation in ACTH, cortisol, aldosterone, or prolactin, even at doses up to 500 mcg/kg. The authors concluded that ipamorelin's clean selectivity profile distinguishes it from all previously described GHRPs, establishing it as a uniquely characterized GH secretagogue for preclinical research.
Johansen et al. demonstrated that ipamorelin administered to young rats over a 2-week period produced significant, dose-dependent increases in tibia length, body weight, and growth velocity. Effects were comparable to exogenous growth hormone treatment in matched controls, confirming that ipamorelin's downstream anabolic signaling through the GH/IGF-1 axis is sufficient to drive measurable skeletal and somatic growth. The findings support ipamorelin peptide's research value as a potent GH secretagogue for bone and body composition studies.
Bowers et al. demonstrated that co-administration of a growth hormone-releasing peptide (GHRP) with GHRH produces a synergistic GH pulse that substantially exceeds what either compound achieves independently. The study identified the dual-receptor mechanism underlying modern GHRP/GHRH combination protocols: simultaneous activation of the ghrelin receptor (by GHRPs such as ipamorelin) and the GHRH receptor (by analogs such as CJC 1295) amplifies GH release well beyond additive effects. This foundational finding provides the scientific rationale for the widely studied CJC-1295 ipamorelin combination in current peptide research.
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