How to Reconstitute Lyophilized Peptides: Step-by-Step Guide

Why Reconstitution Matters

Lyophilization (freeze-drying) is what makes a peptide stable at room temperature for long periods — but it needs to be reconstituted into a liquid solution before it can be used in any protocol. Get the water volume or the technique wrong, and you risk degrading the peptide structure or throwing off concentration calculations for the rest of the vial.

What You Need

Bacteriostatic water (0.9% benzyl alcohol, the correct diluent for every lyophilized peptide in this catalog), a sterile syringe sized for the volume you are drawing, an alcohol swab, and the sealed vial itself. Do not use plain sterile water for anything you plan to store and reuse — bacteriostatic water is what keeps a reconstituted solution stable across multiple uses.

Step-by-Step Process

1. 1Wipe the vial's rubber stopper with an alcohol swab.
2. 2Draw the recommended volume of bacteriostatic water into your syringe (see the table below for each product).
3. 3Insert the needle at an angle and let the water run down the inside wall of the vial — do not spray it directly onto the powder.
4. 4Swirl the vial gently in a circular motion until fully dissolved. Do not shake.
5. 5Check that the solution is clear with no visible particles, then refrigerate immediately.

Reconstitution Volume by Product

Storing the Solution After Reconstitution

Once reconstituted, keep the vial refrigerated. A solution mixed with bacteriostatic water stays stable for up to 28 days under refrigeration — after that window, potency is no longer reliable. Never freeze a reconstituted vial, and always swirl gently to mix rather than shaking, which can damage the peptide structure.

Frequently Asked Questions