Load a TB-500 vial, choose the water volume and read the concentration and syringe units. Arithmetic only, the amount is yours to enter.
Results
0 to 100 units
Fill in the three fields on the left to calculate.
Bacteriostatic water, 10ml →Understanding units
The calculator tells you how many units to draw. Here is exactly what a unit is, and why it means the same thing on every insulin syringe.
On a U-100 insulin syringe one unit is a hundredth of a millilitre. So 10 units is 0.1 mL, and 100 units is 1 mL. Units simply make very small volumes easier to read off the barrel.
It does not matter which insulin syringe you pick up. Drawing to 20 units pulls the same 0.2 mL on a 0.3 mL, a 0.5 mL or a 1 mL syringe. The tick marks never change size.
What changes between syringes is how many of those marks fit on the barrel. A bigger syringe is not a bigger unit, it is just more room.
Example: a 20-unit draw is 0.2 mL on all three syringes above. The only difference is how much empty barrel is left behind it.
The full guide
The TB-500 calculator guide
How the TB-500 dosage calculator works
TB-500 is a synthetic fragment of thymosin beta-4, supplied as a lyophilized powder that has to be dissolved in bacteriostatic water. This TB-500 calculator opens on a 10mg vial with 2mL of water, then turns the vial and the water into a concentration and a syringe reading. The target amount field is empty until you fill it. The amount is set by the protocol a researcher is working to, and the tool has no view on it.
TB-500 reconstitution on a 0.3, 0.5 or 1.0mL syringe
The syringe size selector confuses people more than any other control, so here is what it does. A unit is always 0.01mL, on every U-100 insulin syringe. A 20 unit draw is the same 0.2mL on a 0.3mL, 0.5mL or 1.0mL barrel. What changes is how much empty barrel is left behind it. For a 1mg reading on a 10mg vial:
- In 1mL of water the vial is 10mg/mL, and 1mg is 10 units, which fits any syringe
- In 2mL it is 5mg/mL, and 1mg is 20 units, which fits any syringe
- In 3mL it is 3.33mg/mL, and 1mg is 30 units, which fills a 0.3mL syringe completely
- In 4mL it is 2.5mg/mL, and 1mg is 40 units, which needs a 0.5mL or larger syringe
Pick the syringe in the calculator and the fill bar shows the draw against the barrel, with a warning if the draw is too large for it.
TB-500 reconstitution calculator: milligrams to units
Divide the amount by the concentration for the volume in mL, then multiply by 100 for units. The doses-in-vial figure divides the vial mass by the amount, so a 10mg vial holds ten 1mg draws on paper. Enter the amount in mcg if that is how your figures are written, and 1,000mcg converts to the same 1mg.
Verify the vial and keep a record
Every figure starts from the strength printed on the vial, so confirm it against the certificate of analysis for your batch. Healio publishes each one on the research page, and how to read a certificate of analysis explains which figures actually prove something. Once the vial is mixed, write the water volume, the concentration and the date on the label. Our guide to reconstituting peptides covers the handling, and how long bacteriostatic water lasts covers the in-use window.
TB-500 for sale from Healio is stocked as a 10mg vial. TB-500 benefits explains the actin story behind the compound. It is often paired with another peptide, so see the BPC-157 calculator, or use the all-peptide calculator for any other strength.
TB-500 calculator FAQ
How much bacteriostatic water goes in a 10mg TB-500 vial?
There is no single correct volume. 1mL gives 10mg/mL, 2mL gives 5mg/mL and 3mL gives 3.33mg/mL. More water spreads the same mass across more units, which makes small amounts easier to read.
Does the syringe size change the number of units?
No. A unit is always 0.01mL on a U-100 insulin syringe. A 20 unit draw is the same 0.2mL on a 0.3mL, 0.5mL or 1.0mL syringe. Only the room left in the barrel differs.
How do I convert TB-500 mg to units?
Divide the amount by the concentration to get mL, then multiply by 100. At 5mg/mL, 1mg is 0.2mL, which reads as 20 units on the syringe.
Why does the calculator say the draw is too big for my syringe?
A 0.3mL syringe holds 30 units, a 0.5mL holds 50 and a 1mL holds 100. If the draw is larger than the barrel, use a bigger syringe or reconstitute with less water.
Does the TB-500 dosage calculator recommend an amount?
No. It converts the figures you enter and makes no recommendation. Healio supplies research compounds for laboratory use, so quantities belong to the protocol a researcher is working to.
Is TB-500 calculated differently from BPC-157?
No. The arithmetic is identical. Only the vial strength and the water volume you choose differ. The BPC-157 calculator opens on its own 10mg vial.
Healio Peptides supplies research compounds intended for laboratory and research use only. This calculator performs concentration arithmetic on figures you enter. It does not recommend quantities, and nothing on this page is medical advice. These compounds are not intended for human consumption and these statements have not been evaluated by the FDA.