TB-500 vs Copper tripeptide-1
It is sold as an injection for healing torn muscles and tendons. No study has tested it for injuries in people or animals. A skin-care ingredient sold to firm skin, soften wrinkles and regrow hair. The one controlled human trial, of 13 patients, found no skin benefit.
Both sit at grade C: animal and cell studies. TB-500: Not approved. Copper tripeptide-1: Cosmetic ingredient.
Evidence
CAnimal and cell studies
CAnimal and cell studies
Human studies cited
Animal or cell studies cited
Why the grade
There are no published human trials of TB-500 itself. The only TB-500-specific papers are doping-control chemistry studies that identified the peptide in gray-market and veterinary products and detected it in horses. Human trials exist for full-length thymosin beta-4 (a venous-ulcer safety study planned for 72 patients and an 18-patient eye-drop trial), but those tested a different, larger molecule.
For the skin anti-ageing use, the controlled human evidence is a single randomized trial of 13 patients after CO2 laser resurfacing, which found no objective difference in redness or wrinkles. The rest is gene-expression work in cultured cells, animal wound and lung-injury models, and cosmetic-company studies summarized in reviews written by the peptide's discoverer.
FDA
Not approved
TB-500 is not approved by the FDA for any use and is sold as a research chemical. In July 2026 an FDA advisory committee recommended it for the list of substances pharmacies may compound. On 28 October 2026 HHS issued an enforcement discretion policy covering TB-500 acetate for injection under the skin or into muscle. Licensed pharmacies and physicians may compound it for a named patient if they meet sourcing, testing, labeling and reporting conditions. That is not an approval, and the bulks list decision still needs a rule.
Cosmetic ingredient
Copper tripeptide-1 is a cosmetic ingredient and sits outside FDA drug approval; no copper tripeptide-1 or GHK-Cu product is approved by the FDA as a drug for any use. Injectable GHK-Cu sold online is not approved and is sold as a research chemical.
Sold for
TB-500 is sold online as an injectable healing peptide for torn muscles, tendons and ligaments, often paired with BPC-157.
Copper tripeptide-1 is marketed in serums as a collagen-building, wound-healing peptide that firms skin, softens wrinkles and regrows hair.
Studies say
Nothing published tests TB-500 for injury in humans or animals; the evidence for its parent protein comes from small trials in wounds and the eye, so the grade is C.
Cell and animal studies show it switches on repair genes and speeds wound closure, but the one blinded human trial found no measurable skin benefit over the control regimen, so the evidence is C.
Class
Synthetic Tβ4 fragment
Carrier/copper peptide
Route
Injection
Topical