Overview
In plain English
TB-500 is a synthetic version of thymosin beta-4, a protein your body already makes and releases at the site of an injury.
It is used mainly for recovery: muscle and tendon repair, stiffness and range of motion. It is often run alongside BPC-157 because the two work in completely different ways.
- What it isA synthetic form of thymosin beta-4, injected subcutaneously
- Mainly used forMuscle and tendon recovery, flexibility, mobility
- Typical protocol500mcg once daily for 4–8 weeks
How it works
What it actually does
When tissue is damaged, repair cells have to physically crawl into the wound. To do that they constantly rebuild their internal scaffolding.
Thymosin beta-4 is the body's main controller of the raw material for that scaffolding. It holds a ready supply on standby so cells can move quickly and in the right direction.
That is why the research theme is cell movement and remodelling rather than blood supply — the opposite end of the repair process from BPC-157.
The science in detail
Thymosin beta-4 is a 43-residue, intrinsically disordered peptide and the principal G-actin sequestering protein in mammalian cells. Its defining function is stoichiometric: it binds monomeric G-actin in a 1:1 complex and holds it in an unpolymerisable state. This creates a buffered reservoir of actin monomer that the cell can release on demand, allowing rapid, localised polymerisation of F-actin at the leading edge during migration. The actin-binding activity localises to a central motif, the heptapeptide LKKTETQ, which is why "TB-500" is frequently described as a fragment-based construct rather than the intact protein — a distinction buyers should confirm against the batch assay, since commercial material varies.
The functional consequence of actin buffering is control over cell motility. Cells that must migrate into a wound bed — endothelial cells, keratinocytes, fibroblasts — depend on the ability to rapidly reorganise the cytoskeleton, and thymosin beta-4 sits directly on that control point. Malinda et al. (Journal of Investigative Dermatology, 1999) reported accelerated dermal wound repair with increased keratinocyte migration and collagen deposition in rodent models.
A second, distinct mechanism operates through enzymatic processing. The N-terminal tetrapeptide Ac-SDKP is liberated from thymosin beta-4 by prolyl oligopeptidase and by meprin-α, and this fragment has independent anti-fibrotic and anti-inflammatory activity in its own right — studied, for example, in bleomycin models of pulmonary fibrosis. The parent peptide therefore functions partly as a precursor.
In cardiac tissue, Bock-Marquette et al. (Nature, 2004) reported that thymosin beta-4 activates integrin-linked kinase and promotes cardiomyocyte migration and survival after injury, a pathway independent of the actin-sequestering role.
This is the contrast with BPC-157. TB-500's principal described actions are intracellular and cytoskeletal; BPC-157's are extracellular and vascular, centring on VEGFR2 and nitric oxide signalling. The mechanisms do not overlap, which is why the two are commonly studied together.
Evidence
What the research shows
Controls how repair cells move
It manages the internal scaffolding cells use to migrate into a wound — the step that determines how fast repair starts.
Faster skin repair in animal models
Rodent wound studies reported quicker closure, more cell migration and more collagen laid down.
Different mechanism to BPC-157
BPC-157 works outside the cell on blood supply; TB-500 works inside the cell on movement. That is why they are commonly paired.
Studied in heart tissue too
Research has examined its role in cardiac repair signalling, separate from the wound-healing work.
Mixing & dosage
How to mix and dose it
These are the mixing and dosage instructions supplied by Purist Peptides and the manufacturer for this product.
A 3ml vial of bacteriostatic water is included free with every peptide vial you order, so you have what you need to mix this on arrival.
TB-500 10mg
Step 1 — mix your vial
- Draw up 2ml of bacteriostatic water into a syringe
- Wipe the rubber top of your vial with an alcohol swab and let it dry
- Insert the needle then slowly and carefully push the water down the inside wall of the vial — do not inject water straight onto the peptide powder
- Gently roll the vial between your palms until the powder dissolves completely
- Do not shake
- Allow to settle in the fridge for 5–10 minutes. The liquid should look clear
Step 2 — draw & inject your dose
Use a 1ml insulin syringe to draw and inject your dose. A 1ml syringe = 100 units.
With 2ml of water added, each 0.1ml (10 units) you draw = 500mcg of TB-500.
| Stage | Dose | On the syringe |
|---|---|---|
| Starting | 250mcg daily | 5 units |
| Standard | 500mcg daily | 10 units |
Vial duration at standard dose: 20 days
When to inject: Once daily.
Cycle length: 4 to 8 weeks, then reassess.
How to inject
- Wipe your injection site with an alcohol swab and let it dry
- Pinch a small fold of skin on your abdomen or inject near the area of concern
- Insert the needle at a 45-degree angle into the pinched skin
- Slowly push the plunger down until empty
- Pull the needle out and apply gentle pressure with the swab
- Dispose of the needle safely in a sharps container — never recap or reuse
Storage
Keep refrigerated at 2 to 6 degrees Celsius at all times after mixing. Do not freeze. Protect from light and label the vial with the date you reconstituted it. Discard any solution that is hazy, discoloured or contains particles.
For informational purposes only. This is not medical advice. Speak to a qualified healthcare professional before starting any compound.
Questions
Frequently asked questions
Is TB-500 the same thing as thymosin beta-4?
Not necessarily. Thymosin beta-4 is the full 43-residue endogenous peptide. "TB-500" is a research designation applied both to full-length material and to constructs based on the LKKTETQ active motif, and usage across suppliers is inconsistent. Check the batch assay report to confirm what a given vial contains.
What does actin sequestration actually do?
Thymosin beta-4 binds monomeric G-actin in a 1:1 complex and holds it unpolymerised, creating a reservoir the cell can draw on. Releasing that monomer permits rapid, localised F-actin polymerisation at the leading edge — the mechanical basis of directed cell migration during tissue repair.
How does TB-500 differ from BPC-157?
TB-500's described mechanisms are intracellular and cytoskeletal. BPC-157's are extracellular and vascular, involving VEGFR2 signalling and nitric oxide modulation. Because the two act on different systems, they are frequently examined in parallel rather than as substitutes for one another.
Can it be stored in solution with BPC-157?
Standard laboratory practice is to reconstitute and store the two separately. The stability of a combined solution is not characterised in the literature, and mixing removes the ability to attribute any observed change to either compound.
How is purity verified?
Every batch is assayed by independent HPLC at Bioindustrial Services in Boksburg. We do not rely on the manufacturer's own certificate alone. The assay report for the batch you receive is available on request, and our full testing protocol is set out at Quality Standards.
How long does delivery take?
Orders are dispatched from South Africa, with timelines varying by region and courier. Current dispatch and transit windows are set out at Delivery Process.
Can I return an order?
Because these are laboratory compounds, returns are not accepted once an order has shipped. If your parcel arrives damaged, contact us within 48 hours with photographs of the packaging and product and we will arrange a replacement. The full terms are set out in our Refund Policy.
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