[Muscle Repair Peptide](/)

[See what BPC-157 studies can tell us about an injured muscle.](/bpc-157)
[Find out which peptide the TB-500 research actually tested.](/tb-500)
[Check the evidence for BPC-157 and TB-500 together.](/combinations)
[Put the sport rules and safety questions beside the injury.](/sport-and-care)

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/ 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](https://www.fda.gov/media/193343/download)

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](https://www.fda.gov/media/193349/download)

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](https://www.fda.gov/drugs/human-drug-compounding/certain-bulk-drug-substances-use-compounding-may-present-significant-safety-risks)

On this page, current as of April 22, 2026, both peptides are nominated but withdrawn.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](https://pubmed.ncbi.nlm.nih.gov/18668315/)

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](https://pubmed.ncbi.nlm.nih.gov/40756949/)

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](https://pubmed.ncbi.nlm.nih.gov/34324435/)

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](https://pubmed.ncbi.nlm.nih.gov/20126456/)

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](https://www.fda.gov/drugs/human-drug-compounding/understanding-risks-compounded-drugs)

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](https://www.wada-ama.org/sites/default/files/2025-09/2026list_en_final_clean_september_2025.pdf)

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](https://www.wada-ama.org/sites/default/files/2026-09/2027list_en_final_clean_26_august_2026_2.pdf)

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](https://ncaaorg.s3.amazonaws.com/ssi/substance/2026-27/2026-27NCAA_BannedSubstances.pdf)

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](https://www.fsmb.org/siteassets/advocacy/policies/fsmb-workgroup-on-telemedicineapril-2022-final.pdf)

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](https://www.nlm.nih.gov/web_policies.html)

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.

I keep this a guide to muscle-repair claims, not a clinic, pharmacy or seller.

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