Short answer
TB-500 is a synthetic peptide corresponding to an active region of thymosin beta 4, a naturally occurring protein involved in actin binding and cell migration. It is studied in preclinical models of tissue repair, angiogenesis and cell motility. It is supplied as a lyophilised vial for laboratory reconstitution and holds no marketing authorisation anywhere.
TB-500 is one of the most frequently searched research peptides and one of the most frequently misdescribed. This explainer sets out what the molecule is, what the published record covers, and what it does not.
What exactly is the molecule?
TB-500 is a synthetic peptide that reproduces an active region of thymosin beta 4. Thymosin beta 4 itself is a small protein found in most mammalian cells, best characterised for sequestering actin monomers, which is one of the mechanisms by which a cell changes shape and moves.
Because the full protein is expensive to synthesise, research suppliers have standardised on the shorter fragment. That fragment is what is sold as TB-500.
Which research pathways involve it?
- Cell migration and actin cytoskeleton organisation in cultured cells.
- Angiogenesis models, where new vessel formation is the measured endpoint.
- Wound and tendon repair models in rodents.
- Corneal and dermal healing models, where thymosin beta 4 has the deeper literature.
What the evidence does not establish
There is no approved human use, no marketing authorisation in the European Union, and no clinical outcome data that would justify describing the compound in terms of a benefit. Papers characterise a mechanism in a model system. That is the boundary of what can be said.
How is it compared with BPC-157?
Both appear in tissue repair literature, which is why the two are constantly compared. They are unrelated molecules with different origins: BPC-157 derives from a gastric juice sequence, TB-500 from thymosin beta 4. Our BPC-157 and TB-500 comparison sets the two side by side.
How is it handled in the laboratory?
- Keep the sealed vial refrigerated and shielded from light, frozen for long holds.
- Warm to room temperature before reconstitution so condensation does not form inside the vial.
- Reconstitute with bacteriostatic water against the vial wall, never onto the powder directly.
- Swirl until clear. Do not shake.
- Calculate concentration from the actual vial mass with the reconstitution calculator.
Research use only
TB-500 supplied by Vitality Peps is for in vitro laboratory research only. It is not a medicine or a supplement, and it is not for human or veterinary consumption. Nothing above is dosing guidance.
Frequently asked questions
What is TB-500 in simple terms?
A short synthetic peptide based on part of the sequence of thymosin beta 4. Thymosin beta 4 is a protein present in most cells that binds actin, a structural protein involved in how cells move and reorganise. TB-500 reproduces the region of that protein most examined in the research literature.
Is TB-500 the same as thymosin beta 4?
No. Thymosin beta 4 is a full 43 amino acid protein. TB-500 is a shorter synthetic fragment covering the actin binding region. Suppliers and papers sometimes use the names interchangeably, which is a source of confusion when comparing published studies.
What research is TB-500 used in?
Preclinical work on cell migration, angiogenesis, extracellular matrix organisation and wound models. The literature is largely animal and cell based. No approved human indication exists.
How is TB-500 supplied and stored?
As a lyophilised powder in a sealed vial. Store cold and dark, allow the vial to reach room temperature before reconstituting with bacteriostatic water, swirl rather than shake, and record the batch and reconstitution date.
For research purposes only. Not for human consumption. This article is educational and references published laboratory research; it is not medical advice and does not describe an approved use of any compound.