How to Reconstitute a Peptide: A Simple Step-by-Step Guide
Lyophilized (freeze-dried) peptides arrive as a fine powder. Reconstitution is simply dissolving that powder in a sterile liquid so it can be measured accurately for research. Done correctly, it takes about five minutes.
Time ~5 min Difficulty Easy Research use only
What you'll need
- Your lyophilized peptide vial
- Bacteriostatic water (or 0.6% acetic acid for low-solubility peptides)
- A sterile syringe — a U-100 insulin syringe is ideal for small volumes
- Alcohol swabs
- The peptide calculator to convert your dose into units
Step by step
- Bring everything to room temperature.Let the vial and the water sit out for ~20–30 minutes. Cold liquid dissolves more slowly.
- Sanitize.Wipe the rubber stopper of both the peptide vial and the water vial with an alcohol swab.
- Draw your water.Pull the chosen volume of bacteriostatic water into the syringe (see the table below to pick a volume).
- Add it slowly, down the wall.Angle the needle so the water runs gently down the inner glass wall — never spray it directly onto the powder.
- Swirl, don't shake.Gently roll or swirl the vial. Shaking creates foam and can damage the peptide.
- Let it dissolve.Wait a few minutes until the solution is completely clear. A clear liquid means it's ready.
- Store cold.Keep the reconstituted vial refrigerated at 2–8 °C, away from light.
- Convert your dose.Use the calculator to turn your target dose in mg into syringe units.
How much water should I add?
There's no single right answer — more water just means a lower concentration and a larger, easier-to-measure draw. Here's the same 10 mg vial at three common volumes:
| Water added | Concentration | A 1 mg dose = |
|---|---|---|
| 1 mL | 10 mg/mL | 0.10 mL · 10 units |
| 2 mL | 5 mg/mL | 0.20 mL · 20 units |
| 5 mL | 2 mg/mL | 0.50 mL · 50 units |
Units shown for a U-100 insulin syringe (1 mL = 100 units). Lower concentrations are more forgiving to measure for small doses.
Skip the math. Enter your vial size, water volume and target dose — the calculator gives you the exact units to draw.
Open the peptide calculator →Common mistakes to avoid
- Spraying water straight onto the powder — it foams and can denature the peptide. Run it down the glass instead.
- Shaking the vial. Always swirl gently.
- Using tap or non-sterile water. Only bacteriostatic or sterile water.
- Leaving the reconstituted vial at room temperature. Refrigerate after mixing.
- Mixing more than you'll use soon — check your certificate of analysis for stability guidance.
Research use only. This guide describes general laboratory handling of research-grade, lyophilized compounds for in-vitro research use only. It is not medical advice and not dosing guidance for human or animal use. MVLabs compounds are sold to qualified researchers; always follow applicable laws and your institution's protocols.