TB-500
Also referred to as: Thymosin Beta-4 fragment, TΒ4 (related)
A lab-made piece of a natural protein (Thymosin Beta-4) that helps cells hold their shape and move. Studied mostly in animals for tissue repair and cell movement.
In plain terms: TB-500 is a lab-made copy of an active piece of a natural body protein called Thymosin Beta-4. That protein helps cells build their internal "scaffolding" and move around, which matters for healing. Most of what we know comes from animal and lab-dish studies, not from trials in people.
- Name
- TB-500
- Aliases
- Thymosin Beta-4 fragment, TΒ4 (related)
- Classification
- Synthetic peptide fragment
- Areas studied
- Actin regulation, Tissue repair, Cell migration
What it is
TB-500 is a man-made peptide based on the most active part of Thymosin Beta-4 (often shortened to Tβ4), a protein your body makes naturally. That protein is involved in how cells build their internal skeleton and move from place to place. Researchers use the lab-made piece to study those same processes.
The full natural protein, Thymosin Beta-4, is well understood by scientists. Most of the interest in TB-500 comes from that solid background. But research on the synthetic piece itself is limited and mostly done in animals and cells, not in people.
Mechanism
The main job of Thymosin Beta-4 is to grab and hold a building-block protein called actin. Actin is what cells use to build their internal framework and to crawl and move — so controlling it is central to healing and to how cells travel to where they are needed.
In lab studies, related peptides have been looked at for how they affect cell movement, the growth of new blood vessels, and the signals that rebuild tissue. These effects have mostly been seen in experiments, not confirmed in humans.
Areas studied & investigated
The categories below summarize where TB-500 appears in the research literature. They describe what the compound is studied for and investigated in — not approved uses, and not guidance for any kind of use.
Cell structure
Studied for how it affects actin — the protein cells use to build their internal scaffolding and shape.
Cell movement
Because actin drives how cells move, it is looked at in studies of how cells travel to heal a wound.
Heart & blood vessels
The parent protein has been studied in heart-repair and blood-vessel-growth models, which feeds interest in this piece of it.
Skin & eye healing
Thymosin Beta-4 has shown up in wound-healing studies of skin and the eye — areas that shape research on its fragments.
Research history
Thymosin Beta-4 was first pulled from thymus tissue and later recognized as a major actin-handling protein found in many cell types. Interest in specific active pieces of it — including the sequence behind TB-500 — grew from efforts to copy and study what the full protein does.
State of the literature
The full natural protein has a solid body of peer-reviewed research, including some early human studies in specific situations. Research on the man-made TB-500 piece itself is thinner and mostly in animals. It is not an approved drug.
What to keep in mind
A lot of TB-500's reputation borrows from research on the full natural protein it is based on — but the lab-made piece is not the same thing as the whole protein, and it has been studied far less directly. When you read a strong claim, notice whether the evidence is about TB-500 itself or about Thymosin Beta-4 in general, and remember most of it is still animal and lab-dish work.
Research tools
Evaluating a TB-500 batch for laboratory research? These free, research-use-only calculators help you work the numbers and read the paperwork: the reconstitution calculator solves vial concentration and draw volume, and the COA reader walks a certificate line by line. For how much and how often TB-500 is commonly used, see the dosing guides.
Batch-tested with published COAs
See a published COA for TB-500
Midwest Compounds sells TB-500 with a batch-linked certificate of analysis from an independent lab, published before you buy. This page is educational; purchasing happens on the store.
Citations
The summary above is drawn from published, peer-reviewed sources. Links open the abstract on PubMed, or the free full text on PubMed Central (PMC) where marked.
- Goldstein AL, et al. Thymosin β4: actin-sequestering protein moonlights to repair injured tissues. Trends in Molecular Medicine, 2005. Abstract
- Malinda KM, et al. Thymosin beta4 accelerates wound healing. Journal of Investigative Dermatology, 1999. Abstract
- Crockford D, et al. Thymosin beta4: structure, function, and biological properties supporting current and future clinical applications. Annals of the New York Academy of Sciences, 2010. Abstract