Prohibited
TB-500
TB-500 is named as a prohibited thymosin-beta-4 derivative on the 2026 WADA Prohibited List and is prohibited at all times for covered athletes.
Reviewed Read the full sports-rules reviewSee FDA status for TB-500Sports rules · 34 peptides listed
Are peptides banned in sport?
Many are. Of the 34 peptides on this page, 12 are banned under the World Anti-Doping Agency (WADA) rules we checked. Some of those bans apply only in certain cases. Of the rest, 3 had no ban found in the rules we checked and 19 have no sports-rule review yet. No review, or no ban found, does not mean a peptide is allowed.
Find the peptide below and read its dated review. Then confirm the current WADA list and your governing body's rules. Asking if a peptide is legal? See its FDA status and sports rules together.
A status here is not personal clearance.
No prohibition note does not clear you to compete. Check the current WADA Prohibited List and your governing body before making an eligibility decision.
Showing 1–2 of 2 peptides
No prohibition identified
Thymosin alpha-1
Thymosin alpha-1 is not named in the reviewed 2026 WADA list. Thymosin beta-4 and TB-500 are different substances and are named. This is not personal clearance. Athletes must check the current list and their sport rules.
Reviewed Read the full sports-rules reviewSee FDA status for Thymosin alpha-1What the sports statuses mean
- ProhibitedThe checked rules list this substance or group as prohibited under the stated conditions. Check the current rules for your sport.
- Rule review requiredThe answer depends on current rules and your sport. Check both before you compete.
- No prohibition identifiedThis review did not find a prohibition in the checked record. This does not clear you to compete.
- Not assessedNo current sports-rule review is available.
Before you decide
Check four things first.
Use the record to find the substance. Use current rules to decide your eligibility.
- 01
Did you find the exact peptide and spelling?
- 02
What does the current WADA list say about this substance or group?
- 03
Does your sport or governing body have extra rules?
- 04
Did you check the current rules before you compete?