Short answer: TB-500 is a synthetic peptide built from the active region of thymosin beta-4, one of the most abundant proteins inside your cells. In Canada it is sold as a research chemical, and the safest way to buy it is from a supplier that ships domestically and backs every lot with an independent Certificate of Analysis. This guide covers what TB-500 is, what the published research has examined, how it differs from BPC-157, what it should cost per milligram, and how to tell a real vial from a fake one.
What is TB-500?
TB-500 is a short synthetic peptide modelled on the active region of thymosin beta-4 (Tβ4), a 43-amino-acid protein found in almost every cell in the body outside of red blood cells. Tβ4 was first isolated in the 1980s from thymus tissue, which is where the “thymosin” name comes from, but it turned out to have very little to do with the thymus. Its real job is structural: it binds actin, the protein that forms the internal skeleton of a cell.
Actin is how a cell changes shape and moves. When tissue is damaged, cells near the wound have to migrate into the gap, and that migration depends on how quickly actin can be assembled and taken apart. Tβ4 holds a pool of actin monomers in reserve and releases them when the cell needs them. That single property is why thymosin beta-4 became a research target in wound repair, cardiac injury and connective tissue models.
| Parent protein | Thymosin beta-4 (43 amino acids) |
|---|---|
| Key region | Actin-binding motif LKKTETQ (residues 17–23) |
| Primary mechanism studied | Actin sequestration, cell migration |
| Form supplied | Lyophilized powder |
| Common vial sizes | 2 mg, 5 mg, 10 mg |
| Reconstitution | Bacteriostatic water |
TB-500 vs thymosin beta-4: not the same thing
This is the single most confused point online, so it is worth getting right before anything else.
Thymosin beta-4 is the full natural 43-residue protein. Almost all of the published, peer-reviewed literature, including the high-profile cardiac work in Nature, studied full-length Tβ4.
TB-500 is a shorter synthetic fragment built around the actin-binding region of that protein. The logic is that this region carries much of the activity researchers care about, in a molecule that is smaller and cheaper to synthesize.
That distinction matters in two ways. First, when you read a study, check whether it used Tβ4 or a fragment; the results do not transfer automatically. Second, it means TB-500 sold by different suppliers may not be identical molecules. A proper COA with mass spectrometry tells you which sequence you are actually holding.
Quick rule: if a website quotes thymosin beta-4 studies as proof that its TB-500 “works,” it is mixing up two different molecules. The research is a reason to study TB-500, not evidence of what it does in your protocol.
What the research has studied
Nearly all of the literature is preclinical: cell cultures and animal models. The main threads are below.
1. Wound repair models
The earliest influential work came from the US National Institutes of Health. In 1999, Malinda and colleagues reported in the Journal of Investigative Dermatology that topical and systemic Tβ4 increased re-epithelialization and wound contraction in a rat full-thickness wound model, with increased collagen deposition and new vessel formation. This study is the origin of most of the “healing peptide” reputation.
2. Cardiac injury models
The highest-profile Tβ4 research is in heart tissue. In 2004, Bock-Marquette and colleagues published in Nature that Tβ4 activated integrin-linked kinase (ILK), promoted cardiomyocyte migration and survival, and improved outcomes after induced myocardial infarction in mice. A 2007 follow-up by Smart and colleagues, also in Nature, linked Tβ4 to mobilization of epicardial progenitor cells and new vessel formation in the adult heart.
These are among the most cited peptide papers in regenerative biology, and they are why Tβ4 attracted real pharmaceutical interest.
3. Cell migration and actin dynamics
Underneath every application is the same mechanism. A 2005 review by Goldstein and colleagues in Trends in Molecular Medicine summarized how an actin-sequestering protein ended up implicated in tissue repair: by controlling the actin pool, Tβ4 influences how fast cells can move, which is rate-limiting in many injury models.
4. Connective tissue and tendon models
Researchers interested in tendon and ligament injury study TB-500 because those tissues repair slowly and depend heavily on cell migration into the injury site. This thread is less developed than the cardiac literature, and most of it is still at the animal-model stage.
5. Anti-inflammatory signalling
Several papers report that Tβ4 reduces inflammatory signalling in injury models, including effects on NF-κB pathways. It is an active area, but the mechanisms are not fully mapped.
The honest caveat: pharmaceutical development of thymosin beta-4 went into human trials for wound and eye indications, and none has produced an approved drug in Canada. The animal data is strong enough to keep labs interested. It is not proof of results in people.
TB-500 myths, answered honestly
“TB-500 is the same as thymosin beta-4.”
No. TB-500 is a synthetic fragment based on part of the Tβ4 sequence. See the section above.
“TB-500 only works in the area where it is applied.”
This claim gets repeated in forums in both directions. Distribution and site-specific effects have not been established in controlled human research, so neither version should be treated as fact.
“It is proven to repair tendons.”
Not proven. Tendon and ligament work is mostly animal data. The strongest evidence base is cardiac and dermal, and even that is preclinical.
“All TB-500 on the market is the same molecule.”
No. Different suppliers sell different fragments under the same name, and under-filled vials are common. Only a mass spectrometry identity test confirms what you have.
TB-500 vs BPC-157 (and why researchers pair them)
They are the two most searched recovery-research peptides in Canada, and they are constantly compared. They are not competitors. They work through mechanisms that barely overlap.
| TB-500 | BPC-157 | |
|---|---|---|
| Origin | Fragment of thymosin beta-4 (intracellular protein) | Fragment of a gastric protein |
| Core mechanism studied | Actin regulation, cell migration | Angiogenesis, VEGFR2, nitric oxide |
| Strongest research area | Cardiac and dermal wound models | Tendon, ligament and gut models |
| What it addresses | Cells getting to the injury | Blood supply to the injury |
Because one addresses cell movement and the other blood supply, many research designs study them together. That is why the combination is so common that it has a nickname, the “Wolverine” stack. TrueLabs sells it pre-blended as the BPC-157 + TB-500 blend, or you can buy BPC-157 and TB-500 separately if your protocol needs a different ratio.
For the full BPC-157 picture, read our guide to buying BPC-157 in Canada.
Researchers interested in skin and collagen models also look at the GLOW blend (BPC-157, TB-500 and GHK-Cu) and the four-component KLOW blend, which adds KPV.
Is TB-500 legal in Canada?
TB-500 is not a controlled substance in Canada and is not approved by Health Canada as a drug or natural health product. It is sold domestically as a research chemical, labelled for laboratory use only and not for human or veterinary use.
- Thymosin beta-4 and its fragments are on the World Anti-Doping Agency prohibited list, so they are banned in tested sport.
- Health Canada has issued advisories about unauthorized injectable peptide products marketed to consumers.
All TrueLabs compounds are supplied strictly for in vitro and laboratory research.
How to buy TB-500 in Canada
TB-500 is expensive to manufacture compared to BPC-157, which makes it a prime target for under-filled vials. Use this checklist with any supplier.
- Domestic shipping. A parcel shipped inside Canada never touches CBSA. Delivery takes 2–4 business days instead of weeks, and there is no seizure risk.
- Mass spectrometry identity. Purity by HPLC is not enough for TB-500, because you also need to confirm which fragment you received. Ask for MS or LC-MS data.
- Net content, not just purity. A vial can be 99% pure and still contain 6 mg instead of 10 mg. Good COAs report measured content.
- Batch-specific certificate. The lot number on the COA should match your vial.
- CAD pricing and a Canadian contact. Otherwise it is likely a foreign reseller.
TB-500 price in Canada
Compare suppliers on price per milligram. Canadian domestic TB-500 generally runs higher per mg than BPC-157 because it is a more complex synthesis, and price per mg drops sharply with vial size.
| TrueLabs TB-500 | Price (pre-order) | Per mg |
|---|---|---|
| 2 mg | $55.00 | $27.50 |
| 5 mg | $60.00 | $12.00 |
| 10 mg | $70.00 | $7.00 |
The 10 mg vial is the best value per mg by a wide margin. Orders over $200 ship free anywhere in Canada.
Storage and handling
- Lyophilized powder: −20 °C for long-term storage, 2–8 °C short term, away from light and moisture.
- After reconstitution: refrigerate at 2–8 °C and avoid repeated freeze-thaw cycles, which damage peptides.
- Diluent: bacteriostatic water is the standard laboratory choice because its benzyl alcohol content limits microbial growth in multi-use vials.
Frequently asked questions
Cliquez sur une question pour afficher la réponse.
What is TB-500?
TB-500 is a synthetic peptide based on the actin-binding region of thymosin beta-4, studied in research models of cell migration, wound repair and cardiac injury.
Is TB-500 the same as thymosin beta-4?
No. Thymosin beta-4 is the full 43-amino-acid natural protein. TB-500 is a shorter synthetic fragment built around its active region.
Is TB-500 legal in Canada?
It is not a controlled substance and not approved by Health Canada. It is sold in Canada as a research chemical for laboratory use only.
How much does TB-500 cost in Canada?
At TrueLabs, from $55 for 2 mg to $70 for 10 mg during the current pre-order. The 10 mg vial works out to $7 per mg.
What is the difference between TB-500 and BPC-157?
TB-500 is studied for actin regulation and cell migration; BPC-157 for angiogenesis and nitric oxide signalling. Because the mechanisms are different, researchers often study them together.
Where can I buy TB-500 in Canada?
From a supplier that ships from inside Canada and provides a batch-specific COA with mass spectrometry identity confirmation. TrueLabs ships domestically in 2–4 business days with no customs.
Related reading
- BPC-157 and TB-500 together: the full stack guide
- TB-500 side effects: what the human trials show
- BPC-157 vs TB-500 compared
- How to store peptides
- Buy BPC-157 in Canada: price, purity and research guide
- GHK-Cu copper peptide in Canada: research guide
- How to choose a research peptide supplier in Canada
Selected research references
- Malinda KM, Sidhu GS, Mani H, et al. Thymosin beta4 accelerates wound healing. J Invest Dermatol. 1999;113(3):364–368. PubMed
- Bock-Marquette I, Saxena A, White MD, DiMaio JM, Srivastava D. Thymosin beta4 activates integrin-linked kinase and promotes cardiac cell migration, survival and cardiac repair. Nature. 2004;432(7016):466–472. PubMed
- Smart N, Risebro CA, Melville AA, et al. Thymosin beta4 induces adult epicardial progenitor mobilization and neovascularization. Nature. 2007;445(7124):177–182. PubMed
- Goldstein AL, Hannappel E, Kleinman HK. Thymosin beta4: actin-sequestering protein moonlights to repair injured tissues. Trends Mol Med. 2005;11(9):421–429. PubMed
All TrueLabs products are sold for in vitro and laboratory research use only. They are not intended for human or veterinary use, and nothing in this article is medical advice or a recommendation to use any compound. If you are dealing with an injury or a health concern, please talk to a doctor or physiotherapist.