Ipamorelin
Ipamorelin is universally regarded as the cleanest, mildest, and most strategically precise Growth Hormone Secretagogue (GHRP) available in clinical settings. Distinct from earlier generation peptides, Ipamorelin delivers a potent, sustained pulse of Growth Hormone without cross-activating off-target endocrine pathways, meaning it essentially never induces hunger, lethargy, or massive water retention. It is the premier choice for extended, year-round anti-aging protocols, visceral fat loss, and synergistic stacking with Modified GRF(1-29).
Quick Stats
Scientific Data
Mechanism of Action
Ipamorelin is a highly selective growth hormone secretagogue peptide (GHSP) that acts as a ghrelin receptor (GHS-R1a) agonist. Its defining characteristic is selectivity: unlike GHRP-6 and GHRP-2, Ipamorelin stimulates GH release without significantly elevating cortisol, prolactin, or appetite. This makes it the "cleanest" GH secretagogue available.
Ipamorelin stimulates the pituitary gland to release stored GH in a pulsatile pattern that mimics natural physiology. It is often combined with CJC-1295 (no DAC) for a synergistic GHRH + GHRP effect that maximizes GH output while preserving selectivity.
Source: PMID: 9849822
Background & History
Ipamorelin was discovered by Novo Nordisk researchers in 1998 (Raun et al., European Journal of Endocrinology) as part of a systematic GHRP screening program seeking selectivity. Its defining innovation was near-complete selectivity for GH release without affecting cortisol, prolactin, or ACTH — side effects that plagued first-generation GHRPs (GHRP-6, GHRP-2). This selectivity profile made it the preferred GH secretagogue for research and clinical investigation. It remains the most widely used GHRP in wellness medicine.
Research Use Cases
- ✓Clean GH pulse stimulation without cortisol elevation
- ✓Sleep quality improvement via GH-mediated slow-wave sleep enhancement
- ✓Body recomposition: lean muscle gain and fat oxidation
- ✓Recovery acceleration appropriate for long-term use
- ✓Anti-aging GH restoration in somatopause
Dosing Protocol
| Typical Dose | 100-300 mcg/injection |
| Frequency | 1-3× daily |
| Half-Life | ~2 hours |
| Common Vial Sizes | 2 mg, 5 mg |
Dosing Protocols
Standard Protocol
Stacked with CJC-1295
Body-Weight Dosing Reference
Estimated doses extrapolated from the published research range of 100–300 mcg/day (referenced to 70 kg / 154 lb). These are approximations — consult a qualified healthcare provider for personalised guidance.
| Weight | Low Dose | Target Dose | High Dose |
|---|---|---|---|
| 120 lb(54 kg) | 77 mcg | 154 mcg | 231 mcg |
| 140 lb(63 kg) | 90 mcg | 180 mcg | 270 mcg |
| 160 lb(73 kg) | 104 mcg | 209 mcg | 313 mcg |
| 180 lb(82 kg) | 117 mcg | 234 mcg | 351 mcg |
| 200 lb(91 kg) | 130 mcg | 260 mcg | 390 mcg |
| 220 lb(100 kg) | 143 mcg | 286 mcg | 429 mcg |
| 250 lb(113 kg) | 161 mcg | 323 mcg | 484 mcg |
💉 For exact syringe units based on your vial concentration, use the Ipamorelin Reconstitution Calculator →
Administration
Expected Timeline
Who Is It For?
GH Optimization (Clean)
HighSelective GH release without cortisol, prolactin, or appetite spikes — the cleanest GHRP.
Anti-Aging / Longevity
ModerateLong-term GH/IGF-1 support with minimal systemic side effects.
Reconstitution Example
Safety & Considerations
Research peptide with a favorable safety profile in studies. May cause transient headache or lightheadedness. Minimal effect on cortisol, prolactin, or appetite (unlike GHRP-6). Inject on an empty stomach for optimal GH pulse.
Regulatory & Legal Status
Competitive athletes subject to anti-doping controls should not use Ipamorelin.
Compounded Drug (Rx)
US Compounding: Available via licensed pharmacy Rx
⚠️ This information is for educational purposes only and may not reflect the most current regulatory updates. Always verify with official FDA, WADA, and jurisdiction-specific sources before use.
Interactions & Contraindications
Inject on empty stomach — food/insulin blunts response by 60–80%. Do not combine with growth hormone if IGF-1 is already elevated. Somatostatin analogs (octreotide) antagonize GH release. Hypothyroidism reduces GH receptor sensitivity — address thyroid function first.
Synergies & Common Stacks
The most popular GH secretagogue stack: Mod GRF amplifies pulse amplitude while Ipamorelin provides the clean selective stimulation. Produces 2–5× more GH than either alone.
For convenience-focused protocols: once-weekly CJC-1295 DAC with daily Ipamorelin injections. Provides sustained baseline GH with clean daily pulses.
Recovery stack combining systemic tissue repair (BPC-157) with GH-mediated anabolic and regenerative signals (Ipamorelin).
Ipamorelin vs. GHRP-6
| Attribute | Ipamorelin | GHRP-6 |
|---|---|---|
| Selectivity | High — GH only, no cortisol/prolactin | Low — GH + cortisol + prolactin + ghrelin |
| Appetite Effect | Minimal stimulation | Strong appetite stimulation |
| GH Output | Moderate, clean, dose-dependent | Strong, non-selective pulse |
| Best For | Anti-aging, long-term clean protocol | Muscle building, caloric surplus phase |
| Side Effects | Minimal (transient water retention) | More (hunger, cortisol elevation) |
Verdict: Ipamorelin is cleaner and better tolerated for long-term use. GHRP-6 is better for appetite-driven muscle-building phases where hunger stimulation is a feature, not a bug.
Ipamorelin vs. CJC-1295 (No DAC)
| Attribute | Ipamorelin | CJC-1295 (No DAC) |
|---|---|---|
| Class | GHRP (ghrelin mimetic) | GHRH analog (growth hormone-releasing hormone) |
| Mechanism | Triggers GH pulse via pituitary | Amplifies GH pulse amplitude |
| Stacked Together | Industry gold-standard combination | Industry gold-standard combination |
| Half-Life | ~2 hours | ~30 minutes |
| Solo Effectiveness | Moderate GH pulse alone | Moderate amplitude increase alone |
Verdict: Ipamorelin + CJC-1295 (No DAC) is the most widely used GH optimization stack in current protocols. They are complementary, not competing: GHRP initiates the pulse, GHRH amplifies it.
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Dosing Quick Reference
Frequently Asked Questions
What makes Ipamorelin better than GHRP-6?▼
What is the standard Ipamorelin dose?▼
How long does it take to see results from Ipamorelin?▼
References
- Raun et al. “"Ipamorelin, the first selective growth hormone secretagogue".” European Journal of Endocrinology (1998). PMID: 9849822
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