Free Research Tool

Reconstitution Calculator

Plug in your lyophilized vial strength, how much bacteriostatic water you added, and your intended research unit dose. You'll get the final concentration, exactly how much to draw, and the equivalent units on a standard U-100 insulin syringe.

Bacteriostatic Water Reconstitution Calculator

Enter your lyophilized vial strength, how much BAC water you added, and your intended research unit dose — we'll instantly show your concentration and exactly how many units to draw.

For research reconstitution calculations only. Output is a mathematical dilution figure, not medical guidance, dosing advice, or a recommendation for human or animal administration. Bacteriostatic water sold by ReconPartner is intended solely for laboratory research use under the researcher's own SOPs. Do not administer to any living organism. All ReconPartner products are research use only (RUO).

Worked example

Setup. You have a 15 mg vial of lyophilized research peptide. You reconstitute it with 2 mL of ReconPartner bacteriostatic water and your research protocol calls for a 250 mcg unit dose.

Concentration: 15 mg ÷ 2 mL = 7.5 mg/mL (7,500 mcg/mL)
Draw per dose: 250 mcg ÷ 7,500 mcg/mL = 0.033 mL
U-100 insulin syringe units: 0.033 mL × 100 = 3.33 units
Total doses per vial: 15,000 mcg ÷ 250 mcg = 60 doses

Common questions

What is a U-100 insulin syringe?+

A U-100 insulin syringe is calibrated so 100 units = 1 mL. Most lab insulin syringes (used for sub-mL volumes in research reconstitution work) are U-100. To convert mL → units, multiply by 100.

How much BAC water should I add?+

It depends on the concentration your research protocol calls for. A smaller volume (1 mL) makes a more concentrated solution and smaller draw per dose; a larger volume (3-5 mL) gives a more dilute solution and a larger, easier-to-measure draw. Common research reconstitution volumes are 1, 2, or 3 mL per vial.

How long is reconstituted peptide stable?+

Consult your specific compound's stability data and your lab's SOP. In general, with 0.9% benzyl alcohol bacteriostatic water, a reconstituted vial stored at 2–8 °C and accessed aseptically is typically stable for up to 28 days from first puncture. Always follow your own stability validation.

Does this calculator apply to any specific compound?+

No. It's a generic dilution calculator — it computes concentration and draw volume for any lyophilized material based on the numbers you enter. Compound-specific stability, handling, and research protocols are your responsibility.

Why bacteriostatic water instead of sterile water?+

Bacteriostatic water contains 0.9% benzyl alcohol, which inhibits microbial growth inside the vial once it has been punctured. That's what lets a multi-dose research vial stay usable for up to 28 days. Plain sterile water for injection has no preservative and should be discarded immediately after first access.

Need the water?

ReconPartner 10 mL BAC Water — USP-tested every lot

USA-made. 0.22 µm filtered. USP <71> sterility + USP <85> endotoxin per lot, with a publicly-linked CoA on every product page. Ships same day from the US at ambient temperature.

USP-tested every lot

CoA on every product

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