Peptides

Ipamorelin: Growth Hormone Peptide Benefits, Dosage, and What to Expect

Medically reviewed by Medical Advisory Board Last reviewed 2026-05-13

The cleanest growth hormone secretagogue — how ipamorelin works, what it does, and how it stacks with CJC-1295

Ipamorelin is a selective growth hormone secretagogue that stimulates the pituitary to release GH without significantly raising cortisol or prolactin — making it one of the preferred GHRP peptides for body composition, recovery, and anti-aging protocols.

Ipamorelin is a pentapeptide (5 amino acids) that selectively stimulates growth hormone release from the anterior pituitary. It was developed in the 1990s and studied initially by Novo Nordisk. Unlike older GHRPs (growth hormone-releasing peptides) like GHRP-2 and GHRP-6, ipamorelin is highly selective — it significantly raises GH without meaningfully increasing cortisol, prolactin, or appetite, making it the preferred GHRP for most clinical protocols.

Ipamorelin is almost always stacked with a GHRH analog (typically CJC-1295 or modified GRF 1-29) to create a dual-action GH pulse: the GHRH increases the amplitude of the pulse, while the GHRP (ipamorelin) increases the frequency and selectivity. This combination produces a more physiologically normal GH release pattern than either compound alone. Ipamorelin is a popular starting point for growth-hormone peptide therapy.

Ipamorelin Benefits

Growth hormone stimulation: Ipamorelin produces dose-dependent GH release from the pituitary, raising IGF-1 levels. Unlike exogenous HGH, this preserves the pulsatile pattern and pituitary-hypothalamic feedback loop.
Body composition: Elevated GH and IGF-1 support lean mass preservation, fat metabolism (particularly visceral fat), and improved body composition over 3–6 month protocols.
Recovery and sleep: GH is predominantly released during deep sleep. Ipamorelin administered at bedtime amplifies this natural pulse, improving tissue repair and sleep quality.
Bone density: IGF-1 stimulates osteoblast activity; long-term GH optimization supports bone density preservation.
Anti-aging: GH declines approximately 15% per decade after age 30 (somatopause). GH secretagogues address this decline without the risks of exogenous HGH.

Ipamorelin Dosage (Research Reference)

Standard ipamorelin protocols from clinical research and compounding pharmacy guidance:

Dose range: 200–300 mcg per injection, 1–3 times daily
Most common protocol: 200–300 mcg once daily at bedtime (to amplify the natural nocturnal GH pulse)
Advanced protocols: 200 mcg 2–3x daily (morning before exercise, around workout, and bedtime) to maximize GH pulsatility throughout the day
Stacked with CJC-1295: Ipamorelin 200–300 mcg + CJC-1295 (no DAC) 100–200 mcg per injection, 1–3x daily
Cycle length: 3–6 months on, with 1–2 months off to prevent pituitary desensitization

Ipamorelin vs GHRP-2 and GHRP-6

Peptide	GH Stimulation	Cortisol Effect	Appetite Effect	Selectivity
Ipamorelin	Strong	Minimal	Minimal	High
GHRP-2	Very strong	Moderate increase	Moderate increase	Lower
GHRP-6	Strong	Moderate increase	Strong increase (hunger)	Lower
Hexarelin	Very strong	High increase	Moderate	Lowest

Ipamorelin's selectivity is its key advantage. The significant cortisol and prolactin spikes from GHRP-2 and GHRP-6 can blunt the anabolic effect of GH and cause side effects that make those compounds less suitable for long-term anti-aging protocols.

Choosing between a GHRP and a GHRH analog? See our ipamorelin vs sermorelin comparison for how the two pathways differ and why they're often stacked.

What to Expect: Timeline

Week 1–2: Improved sleep quality and depth (often the first reported benefit). Some users notice better post-workout recovery.
Week 3–4: Energy levels often improve. Lab results begin showing IGF-1 movement from baseline.
Month 2–3: Body composition changes become measurable — modest lean mass increase, some visceral fat reduction with appropriate diet.
Month 4–6: More substantial body composition changes, skin quality improvements, and recovery benefits are typically most pronounced in this window.

Frequently Asked Questions

What is ipamorelin?

Ipamorelin is a synthetic pentapeptide (5 amino acid chain) that acts as a selective growth hormone secretagogue — it stimulates the pituitary gland to release growth hormone in a pulsatile, physiologically normal pattern. It's selective for GH release without significantly raising cortisol, prolactin, or appetite, which distinguishes it from older GHRPs like GHRP-6.

What does ipamorelin do?

Ipamorelin stimulates the pituitary to release growth hormone, which raises IGF-1 levels and produces downstream effects on body composition (lean mass preservation, fat metabolism), tissue repair and recovery, sleep quality, bone density, and the general aging process associated with declining GH (somatopause).

What is the ipamorelin dosage?

Standard ipamorelin dosage in clinical and research protocols is 200–300 mcg per injection, typically administered once daily at bedtime or 2–3 times daily. It's almost always stacked with a GHRH analog like CJC-1295 (100–200 mcg) to produce a synergistic GH pulse. These are research reference ranges, not medical advice.

Does CJC-1295 ipamorelin work?

The CJC-1295 + ipamorelin combination is one of the most evidence-backed growth hormone peptide stacks. CJC-1295 (a GHRH analog) increases the amplitude of GH pulses, while ipamorelin (a GHRP) increases frequency and selectivity. Together they produce a synergistic effect on GH release that exceeds either compound alone, with a cleaner side effect profile than exogenous HGH.

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Medically Reviewed

Medical Advisory Board

Board-Certified Physician

Last reviewed: 2026-05-13

Medical Disclaimer: This content is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before making changes to your health regimen.

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