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PeptideCurator
Research, Reviewed
Peptide

TB-500

A piece of a bigger protein called thymosin beta-4, which your body already makes and which is 43 links long. Sources do not agree on how long the piece is. Most say seven links. Some say seventeen.

Data sheet · Updated August 2026 · How we source this

At a glance

Tier
A Recommended, narrow margin
Chain length
a short fragment
Research area
Tissue Repair Research
First described
1980s
Sold as
Research use only
Approved for people
No
A pharmacy may compound it
No
Where it comes from
A piece of the protein thymosin beta-4

The July 2026 committee vote

8
6
1
8 yes 6 no 1 sat out Recommended · margin of 2

Recorded vote of the FDA Pharmacy Compounding Advisory Committee, 23–24 July 2026. All seven tallies.

Where it stands today

  1. ✓
    Panel vote
    Done
  2. 2
    FDA decides
    Waiting
  3. 3
    Rule written
    Not started
  4. 4
    Pharmacy may compound
    Not started

A yes vote completes step one of four. Nothing about how this compound may be sold has changed. What is left.

What it is

A piece of a bigger protein called thymosin beta-4, which your body already makes and which is 43 links long. Sources do not agree on how long the piece is. Most say seven links. Some say seventeen.

It shows up in the same repair work as BPC-157. The two get talked about together.

It is sold as the piece, not the whole protein. The piece is easier to make. It passed 8 to 6, with one member sitting out.

Where to get it

BioInfinity Direct product link

The widest per-product coverage of anything we have checked, and the only seller that publishes a batch purity figure with the lab that produced it.

  • ✓Research use only labelling
  • ✓Purity published per batch
  • ✓Testing lab named in public
  • ✓Public certificate library
View TB-500 → Read our check →
Peptime Direct product link

American-compounded, trading since 2012. The only seller we have checked that names its testing lab in public and puts a certificate on the product page.

  • ✓Research use only labelling
  • ✓Purity published
  • ✓Testing lab named in public
  • ✓Certificate on the product page
View TB-500 → Read our check →
Amino Club Catalog — no direct link for TB-500

The widest range of the sellers we have checked, and it publishes purity and outside testing. Entry is behind a researcher verification step.

  • ✓Research use only labelling
  • ✓Purity published
  • ✓Says batches are tested outside
  • ✓Returns policy published
Browse the catalog → Read our check →
Advertising disclosure We earn a commission if you buy through these links, at no extra cost to you. It does not change a tier, a vote or a row on any scorecard. Tiers come from a recorded committee vote; scorecard rows come from what a seller publishes and what we could check.

Sold for laboratory research only. Not approved for people to take. Listing a seller is not a recommendation to buy or to use anything.

This sheet describes, it does not recommend. Nothing on it says this compound does anything for anyone. It is not approved for people to take. Talk to a doctor about your health.

← Back to the database  ·  See it on the board

TB-500 Research use only · not approved for people
View product →