TB-500: what it is, how it is sold and how to track it

What it is

TB-500 is a synthetic peptide based on a short active region of thymosin beta-4, a naturally occurring protein of 43 amino acids found in most cells in the body.

Labels sometimes use "TB-500" and "thymosin beta-4" as if they were the same thing. One is a short fragment and the other is the full-length protein, so it matters which one a batch actually is.

How it is usually sold

• As a freeze-dried powder in a sealed vial, labeled by milligrams per vial
• Under either name, TB-500 or thymosin beta-4 (TB4)
• Often in blends, most commonly with BPC-157
• Check the COA to see which form the batch really is

Regulatory status

TB-500 is not an approved medicine in the U.S., and thymosin beta-4 and its derivatives, including TB-500, are on the WADA prohibited list. Check the rules where you live.

Storage basics

Sealed vials are usually kept cold and dark. Once mixed, vials are typically refrigerated and used within a window you set from the vendor's guidance.

How The Pep Planner helps you track it

Name the stock item exactly as the label reads, for example "TB-500" or "Thymosin beta-4," and add the lot number. If the two forms ever end up in your stockpile, keeping them as separate items keeps your history accurate.

Common questions

Why do TB-500 labels differ so much?

Vendors use the names loosely. The COA for your lot is the best way to know whether you have the fragment or the full-length protein.

Does this page recommend an amount?

No. The Pep Planner is an organizer and tracker. We do not give dosing or medical advice.