Muscle peptide research
What muscle peptides have actually been tested for, and what vendors show.
Every post here reads the published trials and the vendor listings for one compound or question. Each carries dates and sources and says what we could not confirm. None gives dosing or protocols, and research materials are sold for laboratory use only. For how we score vendors, see our methodology.
Start here
Best peptides for muscle growth: what each one is and what the evidence shows
No peptide is proven best for muscle growth. What CJC-1295, ipamorelin, IGF-1 LR3 and follistatin are, which trials exist, and who lists them.
Peptides for muscle gain: what trials actually measured
Trials of growth hormone secretagogues, a myostatin blocker and tirzepatide reported lean mass changes. Here are the numbers, the catches and the limits.
Compound by compound
Peptides for muscle recovery: what is known about BPC-157 and TB-500
One small, unblinded human study backs BPC-157, none backs TB-500 alone, and neither is FDA approved. We read the studies, FDA record and four vendors.
Growth hormone secretagogues explained: GHRH analogs, GHRPs and MK-677
Compounds that prompt growth hormone release fall into three groups with two receptors. What each is, which are peptides, and what trials measured.
Peptides vs steroids: how they differ in law, anti-doping rules and evidence
Peptides are not steroids, but that says little about safety. How the US schedules, anti-doping lists, trial evidence and risk records compare.
Follistatin 344: what it is and what has been tested in people
Follistatin binds myostatin and activin. The mouse work, three kinds of human study, why none tests a vial of protein, and what two vendors list.
Sermorelin vs tesamorelin: what separates them and what each has shown
Both are growth hormone releasing hormone analogs, but one is 29 amino acids and the other 44. Structure, approval history, trials and what vendors list.
Myostatin inhibitors explained: what the trials found and what vendors list
Myostatin limits muscle growth, so drugmakers built inhibitors. Five human trials, what each measured, and which of our vendors list related proteins.
IGF-1 LR3: what it is, what has been published, and what the listings say
IGF-1 LR3 is a lab-engineered form of IGF-1. What the change does, the published work we found, anti-doping findings, and what a vendor listing claims.
CJC-1295 and ipamorelin: what each one is and what has been published
CJC-1295 and ipamorelin are sold alone and as a blend. What each compound is, the human studies we found, what reviews conclude, and the vendor paperwork.
Background guides
New to the paperwork? Our research guides explain certificates of analysis, HPLC and mass spectrometry, and research-use-only labeling. The vendor comparison shows how four vendors score on the same checks.