Best Peptides for Muscle Growth & Performance
The peptides most studied for muscle growth are growth-hormone secretagogues such as CJC-1295, ipamorelin, MK-677 (ibutamoren), sermorelin and tesamorelin, which stimulate the body’s own growth-hormone release. IGF-1 LR3 and follistatin are also researched for lean-mass pathways.
Most "muscle" peptides are growth-hormone secretagogues — they prompt the pituitary to release more of the body’s own growth hormone rather than supplying hormone directly. The classic research pairing is a GHRH analog (CJC-1295) with a ghrelin-mimetic (ipamorelin). Oral MK-677 works through a similar pathway. A separate group (IGF-1 LR3, follistatin, PEG-MGF) targets muscle-growth signaling more directly and carries higher uncertainty. Evidence quality varies widely — graded below.
⚠ Research & educational use only — not medical adviceMost-studied compounds for muscle growth & performance
Each links to a full research protocol with reconstitution steps, research dose ranges reported in the literature, and an honest evidence grade. Ranked roughly by depth of supporting research.
CJC-1295 + Ipamorelin
GH secretagogueThe most commonly studied research pairing — a GHRH analog plus a selective GH secretagogue, researched together for steadier GH release.
View protocol →Ipamorelin
GH secretagogueA selective GH secretagogue valued in research for stimulating GH with minimal effect on cortisol or appetite.
View protocol →CJC-1295 (no DAC)
GHRH analogA short-acting GHRH analog studied for pulsatile GH release, often paired with a secretagogue.
View protocol →MK-677
Oral secretagogueIbutamoren — an orally active GH secretagogue studied for sustained increases in GH and IGF-1.
View protocol →Tesamorelin
GHRH analogA GHRH analog with human data, studied for body-composition and visceral-fat outcomes.
View protocol →Sermorelin
GHRH analogOne of the earliest GHRH analogs, researched for GH stimulation with a long clinical history.
View protocol →IGF-1 LR3
IGF-1 analogA long-acting IGF-1 variant studied for direct muscle-growth signaling; potent and higher-risk in research models.
View protocol →Hexarelin
GH secretagogueA potent GH-releasing peptide studied for strong GH stimulation.
View protocol →Follistatin-344
Myostatin pathwayResearched for myostatin inhibition and muscle-mass pathways; largely preclinical.
View protocol →PEG-MGF
Repair factorA pegylated mechano-growth factor studied for muscle repair after mechanical stress.
View protocol →Sourcing these compounds for research
Researchers studying the molecules above source cGMP-tested material from our official sponsor, LiveWell Peptides. All compounds are sold strictly for laboratory research use.
Source at LiveWell Peptides →Preferred vendor. For research use only. Not for human consumption. Not medical advice.
Plan your research
Free tools to take any compound above from vial to a documented protocol.
Frequently asked questions
In research models, growth-hormone secretagogues affect GH/IGF-1 signaling, but body-composition outcomes are studied in the context of training and nutrition. None are a substitute for resistance exercise.
CJC-1295 with ipamorelin is the most frequently studied combination because the two work on complementary pathways. See the dedicated protocol for dose ranges reported in the literature.
Most research peptides discussed here are not FDA-approved for human use and are sold strictly for laboratory research purposes. A few molecules (such as certain GLP-1 receptor agonists) exist in approved prescription forms, but the research-grade material referenced on this site is not the same as a prescription product. Always consult a licensed healthcare provider before making any health decision.
It varies by compound. Some — like the GLP-1 agonists — have large human clinical trials; others (such as BPC-157 or Epithalon) rest mainly on animal and in-vitro data with limited human studies. Each protocol page on this site grades the evidence so you can see exactly what is well-supported versus preliminary.