How to reconstitute peptides
Reviewed by the Rite Aid Health Team · Last updated July 2, 2026
Reconstituting a peptide means adding bacteriostatic water to the freeze-dried powder so you can measure and inject it. Here is how to do it cleanly.
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Step by step
- Clean the stoppers. Wipe the rubber tops of both the peptide vial and the bacteriostatic water with an alcohol swab and let them dry.
- Draw your water. Draw the amount of bacteriostatic water you have chosen into a syringe.
- Add it slowly. Insert the needle at an angle and let the water run slowly down the inside wall of the vial — do not blast it directly onto the powder.
- Swirl, do not shake. Roll or swirl the vial gently until the powder dissolves. Shaking can damage the peptide.
- Rest and refrigerate. Let it settle until the liquid is clear, label it with the date, and store it in the fridge.
What you need
- Bacteriostatic water (not tap, sterile, or saline for a multi-dose vial)
- Alcohol swabs
- An insulin syringe for dosing
- A sharps container
Common mistakes
- Shaking the vial instead of swirling
- Spraying water straight onto the powder
- Using water with no preservative for a vial you plan to reuse
- Adding so much water that small doses are hard to measure
- Storing the mixed vial at room temperature
- Not labelling the date it was mixed
Working out your dose
Once it is mixed, the calculator turns your vial size, the water you added, and your target dose into the exact units to draw.
Related
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For general education only — not medical advice or a treatment recommendation. Peptides are not a substitute for care from a licensed provider. Talk to a qualified healthcare professional before you start, stop, or change any peptide, medication, or supplement.
FAQ
There is no single right amount — 1 to 3 mL is common. More water spreads the dose over more units for easier measuring; less concentrates it. The bacteriostatic water guide walks through choosing a volume.
No. Swirl or roll it gently. Shaking can degrade the peptide. If it does not dissolve right away, let it sit — it will finish on its own.
Refrigerated, most reconstituted peptides are stable for roughly 28 days; some are shorter. Keep it cold and out of light.