Goal · Muscle Growth
Peptides people talk about for muscle growth.
Growth-hormone hopefuls and the rat-data trap.
Get a personalised briefingThe peptides
Graded honestly, hype deflated
CJC-1295
A synthetic GHRH analog that tells your body to make more growth hormone. Half the GH stack, endlessly confused over 'DAC vs no-DAC,' and marketed as 'safe GH' — a phrase that's doing a lot of work.
Ipamorelin
A selective growth-hormone secretagogue, the gentle-reputation other half of the GH stack. 'Cleaner' than the older GHRPs — which people wrongly read as 'proven safe.'
TB-500
A synthetic version of part of the thymosin beta-4 protein, sold as BPC-157's recovery sidekick. Popular in horse racing before it was popular in gyms — which tells you where the evidence comes from.
Not technically peptides
The other stuff people use for this
Steroids, SARMs and secretagogues that target the same goal. Clearly tagged — same rules apply: we grade them, we don't dose them.
Apitegromab
Scholar Rock's myostatin-blocking antibody. Myostatin is the signal telling your body to limit muscle — block it, and the hope is you keep muscle you'd otherwise lose. Being tested alongside GLP-1 drugs so the weight you drop is fat, not muscle.
Bimagrumab
An antibody that blocks the activin type II receptor — the docking station myostatin uses to tell muscle to stay small. Originally a Novartis muscle drug, now owned by Eli Lilly and being tested with semaglutide for fat loss that spares (or even adds) muscle.
Trevogrumab
Regeneron's antibody against myostatin (GDF8) — the third horse in the muscle-preservation race. Being trialled alongside semaglutide, alone and paired with a second antibody, to keep weight loss from eating your muscle.
MK-677 (Ibutamoren)
An orally active growth-hormone secretagogue — crucially, NOT a peptide, despite living in peptide forums. It genuinely raises GH and IGF-1; it also genuinely raises appetite, water retention, and blood sugar.