CJC-1295 + Ipamorelin: The Growth Hormone Stack — Clinical Evidence, Dosing & What to Expect

Medically reviewed by Dr. Sarah Chen, PharmD, BCPS

The CJC-1295 and Ipamorelin combination is the most widely prescribed growth hormone peptide stack in anti-aging and regenerative medicine clinics. By combining a long-acting GHRH analog with a selective growth hormone secretagogue, this stack produces sustained, physiological elevations in GH and IGF-1 without the side effects of exogenous growth hormone.

What Are CJC-1295 and Ipamorelin?

CJC-1295: The Long-Acting GHRH Analog

CJC-1295 is a synthetic analog of growth hormone-releasing hormone (GHRH) consisting of 29 amino acids. CJC-1295 with Drug Affinity Complex (DAC) binds to serum albumin, extending its half-life to approximately 6-8 days.

Teichman et al. (2006) demonstrated that subcutaneous CJC-1295 resulted in sustained, dose-dependent increases in GH and IGF-I levels in healthy adults Teichman et al., 2006.

Ipamorelin: The Selective Growth Hormone Secretagogue

Ipamorelin is a pentapeptide that activates the growth hormone secretagogue receptor (GHSR). Raun et al. (1998) established it as a potent and selective GH secretagogue that did not release ACTH or cortisol significantly Raun et al., 1998.

The Synergy: Why Combine Them?

Yin et al. (2014) highlighted the synergistic effect when GHRH and GHSR agonists are co-administered Yin et al., 2014.

CJC-1295 acts as the “amplifier” — increasing somatotroph capacity via cAMP/PKA signaling.

Ipamorelin acts as the “trigger” — providing pulsatile GH release via PLC/IP3/DAG pathway.

Together, they produce GH elevations 2-3x greater than either peptide alone.

Clinical Evidence

Growth Hormone and IGF-1 Elevation

A single dose of CJC-1295 produced a 2-10 fold GH increase sustained for up to 6 days, with IGF-1 elevated for 9-11 days Teichman et al., 2006.

Safety Profile

Sigalos and Pastuszak (2018) highlighted that GH secretagogues show promise but need more long-term studies Sigalos & Pastuszak, 2018. A 2026 review noted limited evidence for clinical use in humans Mayfield et al., 2026.

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CJC-1295 + Ipamorelin vs. Other GH Therapies

|---|---|---|---|---|

| Feedback Suppression | No | Yes | Minimal | No |

Dosing Protocols

|---|---|---|---|---|

Timing: Best on an empty stomach before bed. Avoid eating for 30-60 minutes after injection, as insulin blunts GH release.

What to Expect: Timeline

| Timeframe | Expected Effects |

|---|---|

| Week 1-2 | Improved sleep quality, vivid dreams |

| Week 3-4 | Increased energy, faster recovery |

| Week 6-8 | Skin quality improvements, body composition changes begin |

| Week 10-12 | Measurable fat loss, lean mass gains, improved IGF-1 on bloodwork |

| Week 12-16 | Full benefits realized; reassess with bloodwork |

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Key Takeaways

The CJC-1295 + Ipamorelin stack represents the current gold standard in peptide-based growth hormone optimization. The clinical evidence supports its safety and efficacy for GH and IGF-1 elevation, though long-term human data remains limited.

> Related Comparison: Tesamorelin vs Ipamorelin: GH Peptide Comparison

> Related Comparison: NAD+ vs NMN: Which Longevity Supplement?

> Related Comparison: Sermorelin vs CJC-1295: Complete Comparison

References

Teichman SL, et al. J Clin Endocrinol Metab. 2006;91(3):799-805. PubMed

Raun K, et al. Eur J Endocrinol. 1998;139(5):552-61. PubMed

Yin Y, et al. Int J Mol Sci. 2014;15(3):4837-55. PMC

Sigalos JT, Pastuszak AW. Sex Med Rev. 2018;6(1):45-53. PMC

Mayfield CK, et al. Am J Sports Med. 2026;54(1):223-229. Link

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Disclaimer: This article is for educational and informational purposes only. It is not medical advice. CJC-1295 and Ipamorelin are research peptides not FDA-approved for clinical use.

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