Ipamorelin & CJC-1295: The Research Behind Growth Hormone Peptides

Ipamorelin and CJC-1295 are peptide-based growth hormone secretagogues (GHS) — compounds that stimulate the pituitary gland to release growth hormone (GH). While they target related pathways, they have distinct mechanisms that make them highly complementary in research settings.

What is Ipamorelin?

Ipamorelin is a selective growth hormone releasing peptide (GHRP) that mimics the hormone ghrelin. It binds to the ghrelin receptor (GHS-R1a) in the pituitary gland, triggering a pulse of growth hormone release.

Key properties:

• ·Selective GH release — does not significantly raise cortisol or prolactin, unlike older GHRPs like GHRP-6
• ·Short half-life — approximately 2 hours, producing a clean, pulse-like GH release
• ·Well-tolerated profile — minimal appetite stimulation compared to GHRP-6 or GHRP-2

What is CJC-1295?

CJC-1295 is a synthetic analog of growth hormone releasing hormone (GHRH), the natural signal that primes the pituitary for GH release. Two versions are commonly studied:

• ·CJC-1295 without DAC — short-acting (~30 min), produces a sharp GH pulse when timed correctly
• ·CJC-1295 with DAC (Drug Affinity Complex) — binds to albumin in the bloodstream, extending half-life to approximately 8 days and producing sustained GH elevation

Why Researchers Stack Ipamorelin and CJC-1295

The two peptides work on separate but synergistic receptor systems:

• ·CJC-1295 (GHRH analog) primes the pituitary and sets the stage for release
• ·Ipamorelin (GHRP) provides the direct trigger for GH secretion

Used together, they produce a GH pulse significantly greater than either peptide alone — a synergistic effect documented in multiple preclinical studies.

Research Applications

Studies have investigated this combination for:

• ·Age-related decline in GH and IGF-1 levels
• ·Muscle preservation and lean mass maintenance
• ·Fat metabolism and lipolysis
• ·Sleep quality improvement (GH is released primarily during slow-wave sleep)
• ·Recovery from injury or surgery

Protocol Considerations

Most research protocols administer both peptides together via subcutaneous injection. Timing relative to meals (typically fasted) is noted to influence GH pulse amplitude due to somatostatin suppression after eating.

Storage

Both peptides are supplied as lyophilized powders. Reconstitute with bacteriostatic water and store refrigerated at 2–8°C. Lyophilized powder can be stored frozen for longer-term stability. See the peptide storage guide for full storage and freeze-thaw guidance.

Browse the full peptide catalogue or use the dosing calculator to plan your research protocol.

Note: Ipamorelin and CJC-1295 are sold strictly for research purposes. Not for human use.