Thymosin-β4 Fragment 17-23
Healing & repair Research only Animal studies
Also called LKKTETQ, the 'TB-500' active region
Seven amino acids from the middle of thymosin-β4 that contain its main actin-binding site. On its own this stretch promoted cell migration, new blood vessels, wound closure and hair growth in lab and animal studies. It is found naturally in wound fluid.
Why people take it
What studies report
- Promoted cell migration, new blood vessels and wound closure in lab and animal studies
- Stimulated hair growth in rodent studies
In practice Unapproved use
- Frequently what is actually sold as 'TB-500'
- Used interchangeably with the full peptide by most buyers
Reported real-world use, not evidence and not a recommendation.
Worth knowing: Animal and cell data only. This short stretch is often what is actually sold as 'TB-500'.
Status: Animal and cell research only.
- Route
- Subcutaneous injection, from reconstituted lyophilised powder
- Sequence
- Leu-Lys-Lys-Thr-Glu-Thr-Gln
- Available as
- 10 mg
Educational information only. Nothing here is medical advice, a dosing protocol, or a recommendation to use any compound. Most entries describe substances not approved for human use. Talk to a licensed clinician before acting on anything you read here. How to read these entries.