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Peptide

TB-500

TB-500 is a synthetic peptide derived from thymosin beta-4, a small protein found in most human cells.

Immune SupportBone & JointFitness

What does FDA say about safety?

FDA reports no identified human exposure data for drug products containing the thymosin beta-4 fragment. It flags possible immune reactions associated with aggregation and peptide impurities. Missing human data leave the magnitude of harm unknown; they do not establish safety. 1

Is TB-500 permitted in tested sport?

The 2026 WADA list prohibits thymosin beta-4 and its derivatives, including TB-500, at all times under S2.3. This covers both competition and training periods. 2

For information, not individual medical advice. Ingredient studies do not establish the effectiveness of these products.

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