TB-500 Explained: Fragment vs Thymosin Beta-4 (Philippines Guide)

Searching TB-500 in the Philippines? You will often see it called thymosin beta-4. They are not the same molecule. Thymosin beta-4 is a natural protein of 43 amino acids, found in most cells.

Its main job is binding actin, the building block cells use to move and repair. TB-500 is a lab-made fragment: seven amino acids from the actin-binding stretch. Most of the evidence is for the full-length protein. A 1999 rat study found it sped up skin wound closure.

A 2004 mouse study found better heart function after an induced heart attack. A small 2015 phase 2 trial tested it as eye drops in nine people with severe dry eye. Fragment evidence is thin. A 2026 scoping review of 80 studies found 70 on thymosin beta-4 and just one on TB-500.

A 2024 cell study found TB-500 itself did not speed wound closure, but one of its breakdown products did. TB-500 has no published human trials. TB-500 is not an approved medicine, and the World Anti-Doping Agency prohibits it, which matters for athletes in the Philippines too. In July 2026, a US FDA advisory panel voted 8 to 6 to recommend it for compounding, against staff advice.

That vote is not final. Wherever you order, Metro Manila or the provinces, ask which molecule is in the vial. If you are sourcing research peptides in the Philippines, Primara Labs publishes independent lab reports you can verify yourself. Guides at primaralabs.

com.