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Source record · Official database · reviewed July 16, 2026

The name alone does not establish identity, purity, sterility, or equivalence to a study material.

Misleading
The circulating claim

“You don't even know what's actually in your TB-500.”

What the source record says

There is no pharmacopeial standard defining “TB-500.” The label may refer to full Thymosin Beta-4 or a shorter fragment, and evidence for one substance may not describe the other.

Why the claim misleads

A familiar nickname can hide differences in chemical identity, formulation, and evidence.

Correction

The name alone does not establish identity, purity, sterility, or equivalence to a study material.

Primary sources
PubChem: Thymosin beta-4Open source ↗FDA staff briefingOpen source ↗TB-500 library entryOpen source ↗
What changed

Added the source-verified Claim Check to the structured claim/source/change registry.

What would change our answer

A well-controlled human study tied to the exact product, population, route, and claimed outcome could change the answer. Mechanism, anecdotes, or a different product cannot substitute for that evidence.

Version history · 1 entry
  1. v1 · 2026-07-16Initial structured record created from the reviewed Claim Check.Source ↗
Boundary: This check evaluates a public claim. It does not assess an individual product or person and is not treatment, dosing, sourcing, or legal advice.