/toolFree calculator

Peptide reconstitution
calculator.

Enter your vial size, how much bacteriostatic water you added, and your target dose — get the exact IU to draw on a U-100 insulin syringe. Works for any vendor's vials.

RECONSTITUTION.CALC

CONCENTRATION 5 mg/ml

PER IU (0.01 ml) 50 mcg

DOSES PER VIAL ~40

DRAW ON U-100 INSULIN SYRINGE

5 IU= 0.05 ml

For laboratory reference only. 1 IU = 0.01 ml on a U-100 syringe.

How to reconstitute a peptide vial

01

Choose your syringe

Use a U-100 insulin syringe — 100 IU markings across 1 ml. Every 10 IU is 0.1 ml.

02

Add bacteriostatic water

Draw your chosen amount of BAC water and inject it slowly down the inside wall of the vial — never straight onto the powder.

03

Swirl, don't shake

Gently swirl until fully dissolved. Shaking can damage the peptide. The solution should be clear.

04

Draw your dose

Use the calculator above to find your draw amount in IU, then pull to that mark. Store reconstituted vials refrigerated.

Reconstitution FAQ

01What is bacteriostatic water?
Bacteriostatic water is sterile water with 0.9% benzyl alcohol added, which prevents bacterial growth so a reconstituted vial can be used over multiple doses. It's the standard diluent for reconstituting research peptides.
02How much BAC water should I add?
There's no single correct amount — more water means a more dilute solution and easier-to-measure larger draws, less water means smaller draws. 1–3 ml is typical. Use the calculator to see how your chosen amount affects the IU per dose.
03How long does a reconstituted peptide last?
Most reconstituted peptides remain stable refrigerated (2–8°C) for roughly 3–4 weeks. Keep vials away from light and never freeze after reconstitution.
04What does 1 IU mean on an insulin syringe?
On a U-100 insulin syringe, 100 IU = 1 ml, so 1 IU = 0.01 ml. The calculator converts your dose in mcg into the exact IU mark to draw to.

For research and laboratory reference only. Not medical advice. Browse research peptides →