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Plain answers

Peptides & the FDA review: your questions, answered

The questions people actually ask - answered in plain English, with links to check the facts yourself. Nothing here is medical advice.

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What was TB-500 evaluated for at the July 2026 meeting?

The FDA-evaluated use listed for TB-500 is wound healing.1

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Is TB-500 the same as thymosin beta-4?

Not exactly. TB-500 is based on a fragment of the natural 43-amino-acid protein thymosin beta-4, and commercial 'TB-500' labeling is inconsistent - some products use the short actin-binding fragment, others the full protein.2 3

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Is TB-500 legal in the United States in 2026?

TB-500 is not an FDA-approved drug and has no cleared compounding pathway. It was in Category 2 of the interim 503A list, then removed in April 2026 and referred to the July 2026 advisory committee. Removal did not place it on the approved list.1 4 5

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