TB-500
Milligrams in, a mark on the barrel out.
A TB-500 vial arrives as dry powder with a milligram figure on the label. What you inject is a volume. This does the conversion between them and draws the result on a real barrel.
- Cost
- Free
- Syringe
- U-100
- Signup
- None
- Data
- Nothing stored
The science
Why the same milligram figure gives different units
01
TB-500 is a synthetic peptide sold as a lyophilised powder, which is a freeze dried solid. The number on the label is a mass, commonly 2, 5 or 10 mg. It says nothing about volume, because until you add water there is no volume to speak of.
02
The water you add sets the concentration, and the concentration sets the mark. Reconstitute 10 mg with 1 ml and you have 10 mg per ml. Use 2 ml instead and the same vial becomes 5 mg per ml. A 500 mcg dose is 5 units on the first and 10 units on the second, from the identical vial.
03
That is the entire reason a calculator exists for this. Nothing about the peptide changed between those two cases, only the arithmetic did, and the arithmetic is where the mistakes happen. People copy a units figure from a forum post without the water volume it was based on, which makes the number meaningless.
04
A U-100 syringe is marked in hundredths of a millilitre, so one unit is 0.01 ml. Converting is therefore dose divided by concentration, multiplied by 100. Doses landing under two units are worth avoiding because the graduations are too coarse to measure them reliably, and more water solves that.
Lookup
Every vial and water combination, precomputed
TB-500 is most often sold in 2, 5 and 10 mg vials. Find your vial down the page, your water volume across the top, and read the units off the row for your dose.
2 mg TB-500 vial
Units on a U-100 syringe
| Dose | 1 ml | 1.5 ml | 2 ml | 2.5 ml | 3 ml |
|---|---|---|---|---|---|
| 250 mcg | 12.5 | 18.75 | 25 | 31.25 | 37.5 |
| 500 mcg | 25 | 37.5 | 50 | 62.5 | 75 |
| 1 mg | 50 | 75 | 100 | · | · |
| 2 mg | 100 | · | · | · | · |
5 mg TB-500 vial
Units on a U-100 syringe
| Dose | 1 ml | 1.5 ml | 2 ml | 2.5 ml | 3 ml |
|---|---|---|---|---|---|
| 250 mcg | 5 | 7.5 | 10 | 12.5 | 15 |
| 500 mcg | 10 | 15 | 20 | 25 | 30 |
| 1 mg | 20 | 30 | 40 | 50 | 60 |
| 2 mg | 40 | 60 | 80 | 100 | · |
| 2.5 mg | 50 | 75 | 100 | · | · |
| 5 mg | 100 | · | · | · | · |
10 mg TB-500 vial
Units on a U-100 syringe
| Dose | 1 ml | 1.5 ml | 2 ml | 2.5 ml | 3 ml |
|---|---|---|---|---|---|
| 250 mcg | 2.5 | 3.75 | 5 | 6.25 | 7.5 |
| 500 mcg | 5 | 7.5 | 10 | 12.5 | 15 |
| 1 mg | 10 | 15 | 20 | 25 | 30 |
| 2 mg | 20 | 30 | 40 | 50 | 60 |
| 2.5 mg | 25 | 37.5 | 50 | 62.5 | 75 |
| 5 mg | 50 | 75 | 100 | · | · |
A dot marks a combination that falls under two units or overflows a 100-unit barrel. Both are hard to measure accurately, so they are worth avoiding rather than eyeballing.
Regulatory status
TB-500 is not an approved medicine
TB-500 is a synthetic fragment related to thymosin beta-4. No regulator has approved it for use in people, which means there is no label, no approved indication and no official dosing guidance to look up. It is sold for research use.
It is also on the World Anti-Doping Agency prohibited list, so it is banned in tested competition at all times rather than only in season.
That absence matters for how you should read this page. The vial sizes in the table are the presentations vendors commonly sell, and the doses are figures people commonly enter. Neither is a recommendation, and the fact that arithmetic can be done on a number does not make the number safe. If you are considering this, the conversation worth having is with a clinician rather than a calculator.
FAQ
Common questions
How do I calculate a TB-500 dose in syringe units?
Divide the milligrams in the vial by the millilitres of bacteriostatic water you added to get the concentration in mg per ml. Divide your dose by that concentration to get volume in ml, then multiply by 100 for units on a U-100 syringe. A 10 mg vial reconstituted with 2 ml is 5 mg per ml, so a 500 mcg dose is 0.1 ml, which is 10 units.
How much bacteriostatic water should I add to a TB-500 vial?
There is no single correct volume. More water makes each dose easier to measure accurately but uses the vial faster if you discard leftovers; less water concentrates it. The practical rule is to pick a volume that puts your intended dose somewhere between 10 and 50 units on the barrel, which is the range where a U-100 syringe reads most reliably. The calculator above shows where any volume lands.
Is TB-500 the same as BPC-157?
No. They are different peptides with different sequences, commonly discussed together and sometimes sold together, but not interchangeable. Neither is approved for human use. If you are calculating for BPC-157 instead, use the BPC-157 page so the vial presentation and the arithmetic match what you actually have.
Why does my calculated dose come out as a fraction of a unit?
Because the concentration is too high for the dose you want. A 2 mg vial in 3 ml is dilute enough to read easily, but a 10 mg vial in 0.5 ml puts a small dose below the smallest graduation on the barrel. Add more water when that happens. Guessing at a fraction of one unit is the least accurate thing you can do with an insulin syringe.
Is TB-500 approved for people?
No. TB-500 has not been approved by the FDA or any comparable regulator for human use. It is sold as a research chemical, and it appears on the World Anti-Doping Agency prohibited list, so it is banned in tested sport. This page does the arithmetic on numbers you enter and does not suggest that a safe or effective human dose has been established, because one has not.
VialClock
This page calculates. Your notes app forgets.
Every tool here is stateless by design. What it cannot do is remember that your vial was mixed eleven days ago, or that a step-up is due this week.
Browse all calculatorsThis tool performs arithmetic on figures you enter, or presents a manufacturer-published schedule. It does not know your protocol, will never suggest a dose, and is not medical advice. Dosing decisions belong with a qualified prescriber.