Is TB-500 the same as thymosin beta-4?

TB-500 is a synthetic fragment related to the natural protein thymosin beta-4. They are discussed interchangeably but are not identical.

Is TB-500 banned in sport?

Yes — it is prohibited under the WADA list, and a positive test carries serious consequences for competitive athletes.

Is there human evidence for TB-500?

The underlying protein, thymosin beta-4, has real wound-healing research behind it, including early human work. The TB-500 fragment itself hasn't been through outcome trials, so human recovery effects rest on that biology plus community experience.

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TB-500 (Thymosin Beta-4)

Animal / preclinicalWADA prohibited

Also known as: TB4, Thymosin β4 fragment

Healing & recoveryRecovery (claimed)Tissue repair (claimed)

Community-reported ranges are anecdotal and not clinically validated. Evidence grade shown reflects the strength of available human data. Not a prescription. Legal status varies by country and changes over time; verify locally.

Overview

A synthetic fragment of thymosin beta-4, a protein central to actin regulation and wound healing. Preclinical work supports the repair biology, which drives its popularity for injury recovery; published human data on the fragment itself are still early-stage.

Mechanism

Thymosin beta-4 regulates actin dynamics and cell migration in wound healing; TB-500 reproduces the fragment thought to carry that activity.

Evidence

Animal / preclinicalWhat does this mean?

Preclinical and early human research support the wound-healing biology; recovery outcomes in humans haven't been formally trialled yet.

Community-reported information

Community reports vary widely. Anecdotal and unvalidated; shown as general information only.

General information only, not tailored to you and not a recommendation. Some regions withhold this entirely.

Half-life

Not well characterised in humans.

Storage

Lyophilised: refrigerate. Reconstituted: refrigerate.

Commonly reported side effects

Not well characterised
Fatigue and head-rush reported anecdotally

Legal status by region

USNot FDA-approved for human use.
AUPrescription-only / prohibited import without authority.

Legal status changes over time; verify locally before relying on this.

Frequently asked questions

Is TB-500 the same as thymosin beta-4?: TB-500 is a synthetic fragment related to the natural protein thymosin beta-4. They are discussed interchangeably but are not identical.
Is TB-500 banned in sport?: Yes — it is prohibited under the WADA list, and a positive test carries serious consequences for competitive athletes.
Is there human evidence for TB-500?: The underlying protein, thymosin beta-4, has real wound-healing research behind it, including early human work. The TB-500 fragment itself hasn't been through outcome trials, so human recovery effects rest on that biology plus community experience.

Citations

Thymosin beta-4 researchPubMed
WADA Prohibited ListWADA