What does the bacteriostatic water calculator do for TB-500?

It divides the amount of powder printed on the vial by the volume of bacteriostatic water added, and reports the result as a concentration and as the amount sitting in each unit mark of a 1 mL U-100 insulin syringe. It is arithmetic. It does not say what amount to use.

Which TB-500 vial sizes are worked out here?

2 mg, 5 mg, 10 mg - one page each.

Why does the same vial have several possible concentrations?

Because the concentration depends entirely on how much water is added. The powder is fixed; the water is a choice. More water means a lower concentration and more volume per unit mark, less water means the opposite. That is the whole of the arithmetic.

Bacteriostatic water calculator for TB-500

TB-500 is supplied in 3 vial sizes on this site (2 mg, 5 mg, 10 mg). Pick the size printed on your vial and the page works out what each water volume gives you, in mg/mL and in unit marks on a 1 mL U-100 insulin syringe.

Also searched as: tb500, tb 500, thymosin beta-4 fragment.

Every TB-500 vial size

Each card shows one example mix. Every page behind it works through a full range of water volumes.

How much bacteriostatic water do you need?

You need about 5 mL of bacteriostatic water to cover any TB-500 vial size on this page.

Every water volume in these charts is between 0.5 mL and 5 mL, so a single 10 mL vial of bacteriostatic water covers the largest of them 2 times over. Bacteriostatic water is sterile water that contains 0.9% benzyl alcohol as a preservative, which is what allows the same vial to be punctured more than once.

See the 10 mL vial

Storage and shelf life

Bacteriostatic water is sterile water that contains 0.9% benzyl alcohol as a preservative. The preservative is the reason a vial can be entered more than once rather than being discarded after a single use. An unopened vial keeps until the expiry date printed on it; once the stopper has been punctured, the discard window printed in the manufacturer’s insert for that vial applies.

Store water and mixed vials as the labelling for each one directs, out of direct light. If the liquid changes colour, goes cloudy, or shows anything floating in it, it goes in the bin rather than in a syringe.

How long bacteriostatic water lasts, in detail

Common questions

What does the bacteriostatic water calculator do for TB-500?: It divides the amount of powder printed on the vial by the volume of bacteriostatic water added, and reports the result as a concentration and as the amount sitting in each unit mark of a 1 mL U-100 insulin syringe. It is arithmetic. It does not say what amount to use.
Which TB-500 vial sizes are worked out here?: 2 mg, 5 mg, 10 mg - one page each.
Why does the same vial have several possible concentrations?: Because the concentration depends entirely on how much water is added. The powder is fixed; the water is a choice. More water means a lower concentration and more volume per unit mark, less water means the opposite. That is the whole of the arithmetic.

TB-500 is a synthetic peptide fragment supplied as a freeze-dried powder and sold for laboratory research use only. It is sold for laboratory research use only and is not approved for human use. This site sells bacteriostatic water. It does not sell TB-500.