Tool
Peptide reconstitution calculator
Enter your vial size, BAC water volume, and desired dose to calculate concentration and draw volume instantly.
Peptide Reconstitution Calculator
Enter your vial and dose details to calculate concentration and draw volume.
concentration = (mg × 1000) ÷ mL | draw = dose ÷ concentration
Educational research tools — not medical advice.
How to reconstitute a peptide
- 01Wipe the rubber stopper of the peptide vial and the BAC water vial with an alcohol swab. Allow to dry.
- 02Draw the desired volume of BAC water into a syringe.
- 03Insert the needle into the peptide vial at an angle, aiming the stream of BAC water at the inside glass wall — not directly at the powder.
- 04Gently inject the BAC water slowly. Do not shake the vial.
- 05Allow the peptide to dissolve on its own. Gently swirl if needed. The solution should become clear.
- 06Store the reconstituted vial in the refrigerator (2–8°C) away from light.
Frequently asked questions
How much BAC water should I add?
The volume of BAC water you add controls concentration. Common volumes range from 1–3mL. Higher volume = lower concentration (larger draw per dose). Lower volume = higher concentration (smaller draw per dose). Use the calculator above to find the exact draw volume for your desired dose.
Why use BAC water instead of sterile water?
BAC water contains 0.9% benzyl alcohol, which inhibits bacterial growth and allows multi-dose use of a vial over several weeks. Sterile water lacks this preservative and should only be used for single-dose applications.
How long does a reconstituted peptide stay stable?
Reconstituted peptides stored refrigerated (2–8°C) are generally considered stable for 4–8 weeks, depending on the peptide and storage conditions. Consult your provider or peptide documentation for specific data.
What is bacteriostatic water?
Read our full guide to BAC water — what it is, why it's used, and how it differs from sterile water.
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