A healing claim needs a matching result.

What was actually claimed

The FDA recorded TB-500 marketing claims about tissue repair, injuries, muscle and stamina. In its review checked September 30, 2026, it found no human study supporting those claims.

A long list of possible uses can leave the basic question untouched: what happened to people with the same problem as yours? Ask for the paper behind the particular claim that caught your attention.

Read a paper with a pencil

Circle the substance name. Underline who or what was studied. Then write down what the authors measured. Keep that result beside the claim rather than letting a hopeful headline stand on its own.

Most research used to support TB-500 claims concerns the full thymosin beta-4 protein. The FDA says that protein is a different substance from TB-500.

A laboratory result has a setting

The FDA found a test in which researchers made a scratch through a layer of cells grown in a dish. They watched how quickly the gap closed. TB-500 did not speed up that closing. A smaller piece left when TB-500 breaks apart did help the gap close a little faster.

That test does not prove TB-500 has no effect in every setting. It also does not provide a healing result in a person.

An advert is not a prior government check

Health adverts reach the public without a government approval step, according to the Federal Trade Commission, which handles US consumer protection.

Save the wording that matters to you. Ask for a direct explanation of it. A reply about popularity, a broad theory or a different protein leaves your original question open.