TB-500 dosage and reconstitution come up constantly in recovery and injury research discussions. Here’s the honest, plain-language version: where the numbers people cite actually come from, why this guide won’t hand you a personal dose, and how the reconstitution math actually works. This content is provided for Research Use Only (RUO).
What Is TB-500?
TB-500 is a synthetic peptide based on the active region of thymosin beta-4, a naturally occurring protein. Researchers have studied it in preclinical research, looking at how it might support cell migration to injury sites, new blood vessel growth, and wound healing across different tissue types. A closer look at what’s actually been studied is covered in our TB-500 benefits guide.
TB-500 has never been approved as a medicine anywhere, and it’s sold and studied strictly as a research compound.
Dosing in Research
TB-500’s dosing picture is thinner than it might appear from how confidently it’s discussed online.
- Most published dosing comes from preclinical research. Rodent and other preclinical models are typically dosed on a body-weight basis, generally in the microgram-to-low-milligram-per-kilogram range depending on the specific study and delivery method.
- Some “human dosing” figures online actually trace back to a different compound. They come from broader thymosin beta-4 clinical research, a related but distinct body of work, rather than from trials on TB-500 itself.
- Administration routes in the preclinical literature are mostly injection-based, with some wound-healing studies using topical or localized application instead.
There’s no established, publicly validated human dosing standard for TB-500, not an approximate one and not a well-documented one. Any specific number circulating online as “the TB-500 dose” is extrapolated from preclinical research, borrowed from separate thymosin beta-4 studies, or simply repeated from other unverified sources, so this guide won’t repeat one. Any dose used in a lab setting should be worked out independently based on the specific study, species, and protocol.
How Reconstitution Works
Reconstituting a peptide just means adding a sterile liquid to the freeze-dried powder in the vial so it becomes a liquid that can be measured out. The strength of the result depends entirely on how much liquid gets added.
The idea is simple: strength equals the amount of peptide in the vial divided by the amount of liquid added. Adding more liquid doesn’t change how much peptide is in the vial, it just spreads that same amount across more volume, so the mix gets weaker, not smaller. Most standard peptide vials hold about 3 mL of liquid in total, which caps how far a single vial can be diluted.
| Water Added (5 mg vial) | Final Strength | What That Means |
|---|---|---|
| 1 mL | 5 mg per mL | A strong, concentrated mix |
| 2 mL | 2.5 mg per mL | A medium-strength mix |
| 2.5 mL | 2 mg per mL | A slightly weaker mix |
| 3 mL | About 1.67 mg per mL | The most diluted of these options |
See also: Peptide Reconstitution Ratios & How to Calculate Them
Researchers typically use bacteriostatic water as the diluent. Our Concentration Calculator does this math automatically, including the exact syringe mark to look for, which removes the risk of a decimal error made by hand.
INJURY AND RECOVERY
TB-500
Mixing Steps
- Wipe both vials with an alcohol swab. The water vial and the peptide vial both need a clean top before a needle goes through either one.
- Add the liquid slowly, down the inside wall of the vial. Letting it run down the glass rather than hitting the powder directly cuts down on foaming.
- Swirl gently. Do not shake. Shaking can stress and damage the peptide, while a slow swirl dissolves the powder just as well.
- Check that it looks right. A clear liquid is the usual result. If it looks cloudy or has particles in it, something didn’t dissolve properly.
- Label the vial right away. Write the date and the final concentration on the vial before it goes anywhere near storage.
Storage and Stability
- Unmixed powder should stay frozen, dry, and out of direct light. The freeze-dried form is far more stable than the reconstituted solution, which is why it ships and stores that way.
- Once mixed, TB-500 is considerably less stable. It should be refrigerated, kept away from light, and used within the timeframe the supplier states. Published shelf-life figures vary by diluent and concentration, so treat them as a starting point, not a guarantee.
- Avoid repeated freezing and thawing. Each cycle adds some degree of degradation. Splitting a solution into smaller portions right after mixing helps avoid repeated thawing if multiple uses are planned.
- Don’t assume TB-500 behaves like BPC-157. The two get grouped together constantly, but they’re structurally different peptides, and stability data for one shouldn’t be assumed to apply to the other without checking the specific research or supplier documentation.
See also: TB-500 vs BPC-157, How Researchers Compare Them
Common Handling Mistakes
- Using the wrong liquid. Tap water or plain saline lack the preservative in bacteriostatic water, which shortens how long a mixed vial stays usable and adds contamination risk.
- Shaking instead of swirling. It feels faster, but it’s also the most common way to damage the peptide.
- Pouring liquid directly onto the powder. This can cause foaming and stress the peptide before it’s even fully dissolved.
- Treating a preclinical-study dose as a human reference point. Doses reported in the literature are scaled to specific preclinical models, and they don’t convert cleanly to a human amount.
- Skipping the certificate of analysis or forgetting to label the vial. Worth checking what’s actually in a batch before using it, particularly for a compound with as much unregulated market activity as TB-500 has.
FAQ
What’s a typical TB-500 dose?
There isn’t an established one. Most published dosing comes from preclinical research, and some of the “human dose” figures that circulate online actually trace back to a related but distinct compound, broader thymosin beta-4, rather than to TB-500 itself. This guide doesn’t provide a dose, and any research use should be designed by qualified professionals.
How do you mix TB-500?
It comes as a freeze-dried powder that gets dissolved in a sterile liquid, usually bacteriostatic water. The final strength depends on how much liquid is added, and our Concentration Calculator works out the exact numbers for a given vial.
Is TB-500 the same as BPC-157 when it comes to storage?
No. They’re structurally different peptides that happen to be discussed together often, and stability data for one shouldn’t be assumed to apply to the other without checking the specific documentation.
Is TB-500 legal?
Rules differ by country, so this is not legal advice. Research material is sold for laboratory use only, and buyers are responsible for following the local, national, and institutional rules that apply to them. TB-500 hasn’t been approved for human use by the FDA or any other health authority, the World Anti-Doping Agency has banned it from competitive sports, and an FDA advisory committee reviewed its pharmacy compounding status in July 2026, a review that doesn’t amount to approval either way.
Research Use Disclaimer
This content is provided for Research Use Only (RUO). The compounds discussed are not drugs, dietary supplements, foods, or cosmetics, and are not intended for human or animal consumption, diagnostic use, or therapeutic use of any kind. They have not been evaluated by the FDA for safety or efficacy in humans. Any research use must be conducted by qualified professionals in a controlled laboratory environment, in accordance with all applicable institutional, local, and federal regulations.
Sources
- Goldstein AL, Hannappel E, Kleinman HK. Thymosin beta4: actin-sequestering protein moonlights to repair injured tissues. Trends in Molecular Medicine. 2005;11(9):421-429.
- Wikipedia. TB-500 (thymosin beta-4), its structure, mechanism, and research history.
