Home / Sources for the muscle-repair claims.
Sources for the muscle-repair claims.
The links below let you check the muscle-repair claims against their sources. Each note explains what the source covers and the main limit on what it can tell us.
Research and official sources
- FDA’s BPC-157 review
The Food and Drug Administration (FDA) reviews BPC-157's small human studies and safety gaps. They do not establish a muscle-injury treatment.
- FDA’s TB-500 review
FDA separates TB-500 from full-length thymosin beta-4. It found no published human study of TB-500, and important safety tests are missing.
- FDA’s substance safety page
On this page, current as of April 22, 2026, both peptides are nominated but withdrawn. That is not clearance. FDA gives no withdrawal dates.
- BPC-157 research in rat muscle crush injury
This experiment used rats with crushed calf muscle. It cannot establish how a person recovers from an injury or returns to sport.
- A review of BPC-157 in orthopaedic sports medicine
This sports-medicine review found mostly animal and lab research. A long reading list can still leave basic human recovery questions unanswered.
- The small look-back report on knee pain
This look-back report concerned knee-joint injections. It lacked an untreated comparison group and standard measures of daily function; muscle recovery remains unanswered.
- The thymosin beta-4 mouse experiment on muscle fibres and strength
Mice with a muscle-wasting disease received full-length thymosin beta-4, not TB-500. Muscle fibres showed more repair, but strength did not significantly improve.
- FDA’s explanation of compounded-drug risks
Compounded medicines are not FDA-approved. FDA does not check their safety, effectiveness or quality before they are sold.
- The 2026 World Anti-Doping Agency prohibited list
The 2026 World Anti-Doping Agency list bans both peptides in and out of competition. It remains in force through December 31, 2026.
- The 2027 World Anti-Doping Agency prohibited list
This replacement takes over on January 1, 2027. It keeps the restrictions on both substances; publication ahead of time does not bring them into force early.
- The 2026–27 college-sport banned-substances list
The National Collegiate Athletic Association's 2026–27 list names both peptides. College sport has its own rules.
- Medical-board guidance on care over a screen
Medical-board model guidance holds remote and in-person care to the same standard. State rules still matter.
- The National Library of Medicine’s web policies
The National Library of Medicine directs personal diagnosis and medical questions to a qualified health professional.
A real paper can still support a much smaller claim
An article about an animal, a different substance or a different problem cannot establish that a peptide helps a person recover from a muscle injury.
Three details worth checking
Which substance was tested? Did researchers study people, an animal or a layer of cells? What actually changed? I use those questions throughout the guide. A long list of links means little if the answer to your injury question is still missing.