Tissue repair & recoveryInjectable

TB-500

Also known as: Thymosin Beta-4 fragment · TB4

TB-500 is a synthetic peptide related to a fragment of Thymosin Beta-4, a naturally occurring protein involved in cell movement and repair, studied for tissue recovery and flexibility.

Physician-reviewedDr. Bushra Mir, Medical Director · DHA-licensedReviewed 10 July 2026

The molecule, up close

Class: Synthetic peptide (Tβ4-related)
Origin: Based on a fragment of Thymosin Beta-4
Chemistry: Short peptide; relates to the actin-binding region of Tβ4
Typical format: Injectable
Regulatory status: Prescription-only; not permitted in competitive sport

This page is educational information, not medical advice or an offer of treatment. Peptides used clinically are prescription medicines; whether any is appropriate for you is a decision a physician makes after a diagnostic assessment.

What it is

Thymosin Beta-4 is a protein the body produces widely, with a well-described role in how cells organise and move during repair. TB-500 is a synthetic peptide related to an active fragment of that protein, studied as a more practical way to explore those repair-related effects.

It sits alongside BPC-157 in the popular "recovery" category, and shares the same caveat: research interest and marketing enthusiasm have run ahead of controlled human evidence.

What it's studied for

Interest focuses on muscle and soft-tissue recovery, flexibility, and the cell-migration processes involved in healing. It's explored in models of tissue and, in some work, cardiac repair.

These remain areas of study. TB-500 is researched for recovery-related biology rather than established as a recovery treatment.

The science

Thymosin Beta-4 regulates actin, a protein central to how cells move, migrate and reorganise during repair. TB-500 is studied for related effects on cell migration, new blood-vessel formation and the coordination of tissue repair.

As with other repair peptides, the detail in people isn't yet settled, and most of the picture comes from lab and animal research.

Typical form

Injectable

Shown in the dispensing format most often used in research and clinical settings. Where any protocol is appropriate, the route, dose and schedule are a physician’s decision — not a fixed recipe.

Safety & considerations

Prescription-only, physician-supervised and individualised where used. Limited human safety data mean assessment, dosing and monitoring are a doctor's responsibility.

Sourcing quality is a real risk to manage, as with all research peptides. Unregulated product introduces variables a clinical setting is designed to remove.

Status & oversight

TB-500 is a research compound used under medical supervision rather than an off-the-shelf drug. It's also prohibited in competitive sport under World Anti-Doping Agency rules — a separate consideration from how it's used clinically.

Common questions

TB-500, in brief.

What is TB-500 used for?

It's studied for muscle and soft-tissue recovery and flexibility. It's still being researched for these areas rather than proven, and it's used only under physician direction.

Is TB-500 the same as Thymosin Beta-4?

Not exactly. TB-500 is a synthetic peptide related to an active fragment of the natural protein Thymosin Beta-4, studied as a way to explore its repair-related effects.

Is TB-500 banned in sport?

Yes. It's on the World Anti-Doping Agency prohibited list, so competitive athletes should not use it. This is separate from its medical status.

Is TB-500 safe?

Human safety data are limited, which is why it's prescription-only and physician-supervised. Product sourcing is a central concern, and eligibility is a clinical decision.

Peptides of this kind are prescription medicines. Whether any protocol is appropriate is decided the way the rest of the practice works — from data, after an assessment.

How our longevity assessment works Back to the peptide field guide

How this is written

Physician-reviewed and evidence-led. We describe what a compound is studied for and where the evidence stands — not what it will do for you — and we revise pages as the science changes. Reviewed by Dr. Bushra Mir, Medical Director · DHA-licensed.

References

Peer-reviewed references for this compound are added by the physician author before publication.