Not medical advice. Talk to your provider before using any peptide.
Full disclaimerBest Peptides for Muscle Growth
Peptide Schedule Research Team
The most effective peptides for building lean muscle mass — from FDA-approved growth hormone to secretagogues, IGF-1, and recovery peptides that support hypertrophy.
Expert Protocols
Verified protocols from researchers, physicians, and creators who have publicly disclosed their dosing.
The most replicated GH peptide stack. Bedtime dosing, 5 on / 2 off, 8 weeks on / 8 off.
Targets IGF-1 ~500 ng/mL. CJC-1295 DAC 2.5mg 2x/week + MK-677 25mg oral daily. Advanced users only.
HGH (Somatropin)
The gold standard. Recombinant human growth hormone has been FDA-approved since 1985 and directly elevates GH and IGF-1 in a dose-dependent, predictable way. The Rudman et al. study (NEJM, 1990) showed 8.8% lean mass increase and 14.4% fat loss in six months. No secretagogue matches the reliability of the actual hormone.
- FDA-approved with decades of safety data
- Predictable, dose-dependent GH elevation
- Proven lean mass and fat loss in clinical trials
- Improves sleep, skin, bone density, and recovery
- Expensive — especially pharmaceutical-grade brands
- Requires daily SC injection
- Can affect insulin sensitivity at higher doses
- Needs IGF-1 monitoring every 3-6 months
CJC-1295 (No DAC)
The foundation of any GH secretagogue stack. CJC-1295 (No DAC) amplifies natural growth hormone pulses for increased IGF-1, better recovery, and lean mass gains. More affordable than HGH and preserves natural pulsatile release patterns.
- Natural pulsatile GH release
- No cortisol or prolactin elevation
- Synergistic with Ipamorelin
- Much cheaper than pharmaceutical HGH
- Requires empty stomach dosing
- Short half-life (~30 min)
- Best results require stacking
- Research-only — no FDA approval
Ipamorelin
The cleanest GHRP available. Triggers growth hormone release without the cortisol, prolactin, or hunger spikes seen with GHRP-2/6. Ideal for sustained use in body composition protocols.
- No cortisol, prolactin, or appetite spikes
- Very well-tolerated for long-term use
- Excellent synergy with CJC-1295
- Promotes deep sleep (GH release)
- Moderate GH release compared to GHRP-2
- Best used in a stack, not standalone
- Research-only — no FDA approval
Tesamorelin
The only FDA-approved GHRH analog (brand name Egrifta). Tesamorelin is the most potent GHRH peptide — it produces strong natural GH pulses and is clinically proven to reduce visceral belly fat by ~18%. Also shows cognitive benefits in published studies.
- FDA-approved (Egrifta) with strong safety data
- Most potent GHRH for pulsatile GH release
- Proven visceral fat reduction
- Cognitive benefits shown in research
- Approved for HIV lipodystrophy — off-label for other uses
- Daily injection required
- Short half-life (26-38 min)
MK-677 (Ibutamoren)
The only oral growth hormone secretagogue. MK-677 provides 24-hour GH elevation, raises IGF-1 by 40-60% within weeks, and improves deep sleep. The appetite stimulation is a plus during bulking phases.
- Oral dosing — no injections needed
- Once-daily dosing
- 24-hour GH and IGF-1 elevation
- Strong appetite stimulation for bulking
- May increase blood sugar and insulin (safety grade C)
- Water retention common
- Not suitable for cutting phases
- Research-only — no FDA approval
IGF-1 LR3
A modified IGF-1 with a 20+ hour half-life (vs 15 minutes for natural IGF-1). Directly promotes muscle cell proliferation and hyperplasia — actual new muscle fiber creation, not just hypertrophy. An advanced-user peptide.
- Promotes muscle hyperplasia (new fibers)
- Very long half-life (20+ hours)
- Potent anabolic effects
- Also promotes recovery
- Potent — requires careful dosing
- Can cause hypoglycemia
- Not for beginners (safety grade C)
- Expensive
Head-to-Head Comparisons
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How We Ranked These
Ranked by impact on lean mass, strength of clinical evidence, FDA approval status, tolerability, and suitability across experience levels. FDA-approved options rank above research-only compounds. Peptides that support both muscle growth and recovery score higher.
Beginner Recommendation
Start with CJC-1295 + Ipamorelin — the safest, most effective GH secretagogue stack and far more affordable than HGH. Add MK-677 if you want oral dosing or extra appetite for bulking.
View Growth Hormone Stack→