Understand the source comparison
Do Peptides Help with Muscle Building?: Peptide Comparison
GHRP-2 Ghrelin receptor agonist. Stimulates endogenous GH release 100–200mcg 2–3x daily (fasted or pre-training) 3–4 weeks (IGF-1 elevation); 6–8 weeks (lean mass gains) Stimulates natural GH pulse without suppressing endogenous production Requires multiple da
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This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- GHRP-2
- Ghrelin receptor agonist. Stimulates endogenous GH release
- 100–200mcg 2–3x daily (fasted or pre-training)
- 3–4 weeks (IGF-1 elevation); 6–8 weeks (lean mass gains)
- Stimulates natural GH pulse without suppressing endogenous production
- Requires multiple daily injections; effects plateau after 8–12 weeks without cycling
- Best for researchers prioritising natural hormonal rhythm preservation with moderate hypertrophy
- CJC-1295 (with DAC)
- GHRH analog with extended half-life (6–8 days)
- 2mg once weekly subcutaneously
- 2–3 weeks (sustained IGF-1 rise); 4–6 weeks (lean mass)
- Once-weekly dosing; sustained GH elevation without multiple injections
- Risk of pituitary desensitisation with prolonged continuous use (>12 weeks)
- Ideal for convenience-focused protocols where compliance with daily injections is a barrier
- Ipamorelin
- Selective ghrelin receptor agonist (GH release without cortisol/prolactin spike)
- 200–300mcg 2–3x daily
- 4–5 weeks (lean mass gains measurable via DEXA)
- Minimal side effects; no cortisol or appetite stimulation
- Slower onset compared to GHRP-6; requires consistent daily administration
- Best choice for research requiring selective GH stimulation without metabolic side effects
- MK 677 (Ibutamoren)
- Oral ghrelin receptor agonist (non-peptide)
- 25mg once daily (typically at bedtime)
- 3–4 weeks (IGF-1 +60–90%); 6–8 weeks (lean mass +1–2kg)
- Oral bioavailability; 24-hour half-life; no injections required
- Significant appetite stimulation; potential insulin resistance with use >12 weeks
- Optimal for oral-route research or populations unable to self-administer injections
- Hexarelin
- Potent synthetic GHRP (strongest GH pulse amplitude)
- 100mcg 2x daily (morning fasted, pre-training)
- 2–3 weeks (rapid IGF-1 spike); 4–6 weeks (lean mass)
- Strongest single-dose GH response among secretagogues
- Rapid receptor desensitisation (efficacy drops significantly after 4 weeks continuous use); prolactin elevation
- Short-term research applications only. Not suitable for protocols exceeding 4–6 weeks
- Peptides help with muscle building most reliably when the peptide class matches the research objective. For long-duration hypertrophy studies (12+ weeks), CJC-1295/ipamorelin combinations outperform single agents due to reduced desensitisation and side-effect profile. For short-term mechanistic studies examining acute GH response, GHRP-2 or Hexarelin provide the clearest signal. MK 677 suits compliance-sensitive research where daily injections create adherence issues.