Source comparison
Hexarelin vs Ipamorelin: Feature Comparison
Before selecting one peptide over the other, researchers must weigh receptor selectivity, side effect tolerance, and protocol duration requirements. This table summarises the core differences. Primary Receptor Target GHSR-1a + CD36 (dual activation) GHSR-1a on
This comparison does not assign a generated winner or score.
- Before selecting one peptide over the other, researchers must weigh receptor selectivity, side effect tolerance, and protocol duration requirements. This table summarises the core differences.
- Primary Receptor Target
- GHSR-1a + CD36 (dual activation)
- GHSR-1a only (highly selective)
- Hexarelin's CD36 binding amplifies GH output but introduces cardiac and vascular signaling that complicates interpretation in metabolic studies
- Peak GH Secretion (vs Baseline)
- 8–12× baseline at 200 mcg dose
- 3–5× baseline at 200 mcg dose
- Hexarelin produces higher absolute GH levels, but Ipamorelin's flatter pulse may yield comparable anabolic endpoints over 24-hour periods due to sustained elevation
- Cortisol Elevation
- +25–40 ng/dL at therapeutic doses
- <5 ng/dL (minimal to none)
- Hexarelin's cortisol spike confounds body composition studies; Ipamorelin avoids this entirely
- Prolactin Elevation
- +50–80 ng/mL (significant spike)
- Baseline (no measurable change)
- Elevated prolactin with Hexarelin can suppress gonadotropins and interfere with reproductive hormone endpoints
- Desensitisation (Tachyphylaxis)
- Occurs after 4–6 weeks of daily use
- Minimal even after 12+ weeks
- Hexarelin requires cycling (2–4 week washout); Ipamorelin supports continuous protocols
- Optimal Dosing Range
- 100–200 mcg per administration
- 200–500 mcg per administration
- Hexarelin's potency ceiling is lower. Higher doses add side effects without proportional GH gains
- Bottom Line
- Best for short-duration, high-intensity GH pulse research where secondary hormones are monitored or irrelevant
- Best for chronic protocols requiring sustained GH elevation without cortisol or prolactin confounds
- Use Hexarelin when peak GH output matters more than duration; use Ipamorelin when protocol length or hormonal selectivity is the priority