Best Peptides for Muscle Growth
GH/IGF-1-axis compounds ranked on clinical-tagged growth-hormone evidence, from CJC-1295 to hexarelin.
Muscle-growth peptides almost all work through the GH/IGF-1 axis — they raise endogenous growth-hormone signalling rather than acting as direct anabolics. We ranked by clinical-tagged GH and IGF-1 evidence, then regulatory status, then side-effect profile. Direct anabolic candidates (ACE-031, follistatin, MGF, IGF-1 LR3) were excluded: their catalogued data is anecdotal-only, terminated in trials, or both. Every compound here is a research chemical or prescription drug — none are dietary supplements.
The Ranked List
GHRH analogue with clinical-tagged data: 2–10-fold GH increases lasting over 6 days and roughly a 45% IGF-1 increase; the DAC version extends half-life from minutes to 6–8 days.
Reported dose: 100–300 mcg 1–2×/day (no DAC) or 2 mg 1–2×/week (DAC)
Half-life: ~30 min (no DAC) / 6-8 days (DAC)
Route: SC
Oral ghrelin mimetic and GH secretagogue with clinical-tagged increases in fat-free mass and sleep quality (50% more stage IV, 20% more REM); watch appetite, water retention and glucose.
Reported dose: 10–25 mg daily (oral)
Half-life: ~24 hours
Route: Oral
GH-releasing peptide with clinical-tagged IGF-1 elevation (159.5 to 239.0 ng/mL) and lean-mass improvement in the catalogue.
Reported dose: 100–300 mcg 2–3×/day
Half-life: ~30 minutes
Route: SC
Selective GH secretagogue with clinical-tagged GH selectivity — no cortisol or ACTH release — and 18 catalogued benefits; muscle-growth claims are mostly anecdotal-tier.
Reported dose: 100–300 mcg 1–3×/day
Half-life: ~2 hours
Route: SC
GHRH analogue with an FDA-approved indication for growth hormone deficiency; pulses endogenous GH with a short 10–20-minute half-life.
Reported dose: 200–500 mcg daily
Half-life: 10-20 minutes
Route: SC
Synthetic hexapeptide with strong GH-releasing activity and clinical-tagged cardiac data, but desensitisation concerns keep it at the bottom of this list.
Reported dose: 100–300 mcg 2–3×/day
Half-life: 30-55 minutes
Route: SC
Safety Note
Most compounds on this page are prescription drugs or research chemicals — not supplements. None of this content is medical advice: review each compound's full guide and safety note, respect WADA status if you compete, and consult a qualified clinician before making any health decision.
Frequently Asked Questions
Do these peptides build muscle directly?
No — every ranked compound works through the GH/IGF-1 axis, raising endogenous growth-hormone signalling. Direct anabolic pathways (myostatin inhibition, IGF-1 analogues) were excluded because their catalogue data is anecdotal-only or trial-terminated.
Why is CJC-1295 ranked first?
It carries clinical-tagged evidence of 2–10-fold GH increases lasting over 6 days and roughly a 45% IGF-1 increase, with the DAC version extending half-life from minutes to 6–8 days.
Are GH secretagogues safe?
They are research chemicals, not approved supplements. MK-677 is oral but can increase appetite, water retention and glucose; ipamorelin has the mildest reported side-effect profile. All six picks are WADA-banned for athletes.
How do GHRP-2, ipamorelin and hexarelin differ?
Ipamorelin is the most selective (no cortisol or ACTH release), GHRP-2 has clinical-tagged IGF-1 elevation data, and hexarelin adds cardiac-focused research but carries desensitisation concerns with repeated use.
Where Researchers Source Compounds
If you are exploring these compounds in a legitimate research setting, our partner store Peptide Hackers carries catalog-grade research peptides with third-party testing. We only link to suppliers we trust.
Visit Peptide Hackers →Other Goals
Weight Loss
The GLP-1 class dominates, with three FDA-approved picks and clinical-tagged weight-loss data across the board.
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Anti-Aging & Longevity
GHK-Cu, epithalon, SS-31 and more — ranked on longevity evidence from clinical to preclinical.
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Sleep Quality
DSIP and MK-677 top a sleep-architecture list built on clinical-tagged sleep data.
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Cognitive Performance
Semax and Selank lead a nootropic ranking backed by BDNF and stress-response research.
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Sexual Health & Libido
PT-141, gonadorelin, HCG and kisspeptin, ranked with the regulatory and safety caveats they demand.
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Research purposes only. This ranking reflects the depth of published and catalogued evidence, not a recommendation to use any compound. Most peptides here are not approved for human use; always consult qualified medical professionals before making health decisions.