How to Reconstitute Peptides
Most research peptides ship as a freeze-dried (lyophilized) powder. Before they can be measured or administered, they need to be dissolved into a sterile liquid — a process called reconstitution. This guide walks through the math, the materials, and the technique step by step.
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What you'll need
- Lyophilized peptide vial
- Bacteriostatic water (0.9% benzyl alcohol)
- Insulin syringe, U-100 (1 mL)
- Alcohol prep pads
Step 1 — Do the dosing math
The math is simple: the volume of bacteriostatic water you add determines how many units on an insulin syringe equal one dose. A U-100 syringe has 100 units per 1 mL.
Step-by-step procedure
Sanitize the vials
Wipe the rubber stoppers of both the peptide vial and the bacteriostatic water vial with an alcohol prep pad. Let them air-dry for a few seconds.
Draw the bacteriostatic water
Pull the calculated volume of bacteriostatic water into the insulin syringe. Tap out any large air bubbles.
Add water to the peptide — slowly
Insert the needle into the peptide vial and angle the tip so the water runs down the inside wall of the glass. Never inject water directly onto the powder — the force can denature the peptide.
Swirl, do not shake
Gently roll the vial between your palms until the powder fully dissolves into a clear solution. Shaking introduces foam and can damage the molecule.
Inspect
The reconstituted solution should be clear. Cloudiness, particles, or discoloration mean the vial should not be used.
Refrigerate
Store the reconstituted vial at 2–8°C (standard fridge). Most reconstituted peptides are stable for 2–4 weeks; check the specific peptide's stability data.
Storage at a glance
Common mistakes to avoid
- • Using sterile water or saline instead of bacteriostatic water for multi-use vials.
- • Shaking the vial — this can fragment the peptide.
- • Injecting the diluent directly onto the powder pellet.
- • Storing reconstituted peptides at room temperature.
- • Skipping the dosing math and guessing volumes on the syringe.
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