Research · Getting Started

How to Reconstitute
Peptides — Step by Step.

ALPHA+ LABS · JUNE 2026 · 4 MIN READ

Lyophilized (freeze-dried) peptide powder needs to be reconstituted with bacteriostatic water before use. This converts the dry powder into a stable liquid solution. The process is straightforward — but doing it correctly matters for the integrity of your research compound and its stability in storage.

What You Need

Before you start, gather the following: your peptide vial, bacteriostatic water (BAC water), a fresh insulin syringe or V2 pen with cartridge, and an alcohol swab. Having everything within reach before you open anything keeps the process clean and reduces contamination risk.

Why Bacteriostatic Water?

Bacteriostatic water contains 0.9% benzyl alcohol, which acts as a preservative that inhibits bacterial growth in the solution. This is what makes it suitable for multi-use vials — unlike sterile water for injection, which should only be used once, BAC water keeps your reconstituted solution stable for 4–6 weeks when refrigerated. Never use tap water, distilled water, or plain sterile water for peptide reconstitution.

The amount of BAC water you add determines the concentration of your solution. More water = lower concentration per mL = larger injection volume per dose. Less water = higher concentration = smaller volume per dose. Use our dosing calculator to find the right ratio for your target dose.

Step-by-Step Reconstitution

STEP 01

Clean the vial tops

Wipe the rubber stopper on both your peptide vial and your BAC water vial with an alcohol swab. Let them air dry for 10–15 seconds before proceeding.

STEP 02

Draw your BAC water

Using a fresh syringe, draw the amount of BAC water you need. For most protocols: 1mL, 2mL, or 3mL depending on your target concentration. A 10mg vial with 2mL of BAC water gives you a 5mg/mL solution.

STEP 03

Add water slowly down the side

Insert the syringe into the peptide vial and angle it so the water flows down the inside wall of the vial — not directly onto the powder. This prevents foaming and degradation from mechanical agitation. Release the water slowly.

STEP 04

Swirl gently — never shake

Once the water is in, gently swirl the vial in a slow circular motion until the powder fully dissolves. This usually takes 15–30 seconds. Never shake the vial — the agitation can denature (damage) the peptide structure.

STEP 05

Inspect the solution

Hold the vial up to light. The solution should be clear and colourless (or very slightly tinted depending on the compound — GHK-Cu will appear faintly blue). If you see cloudiness, particulates, or the powder hasn't fully dissolved, swirl gently again.

STEP 06

Store correctly

Refrigerate reconstituted peptides at 2–8°C (standard fridge temperature). Keep them away from light. Reconstituted solutions are typically stable for 4–6 weeks when properly refrigerated. Do not freeze reconstituted peptides.

Calculating Your Dose

Once reconstituted, the amount you inject depends on your target dose and the concentration of your solution. Use the ALPHA+ Labs dosing calculator — enter your vial size, the amount of BAC water you added, and your target dose. It'll give you the exact mL to draw and the units on your syringe, including for the V2 reusable pen.

Common Mistakes

Shaking the vial. Always swirl, never shake. Peptides can denature under mechanical stress.

Adding water too fast. Slow and steady down the side of the vial prevents foaming.

Using the wrong water. Only use bacteriostatic water for multi-use vials. Plain sterile water has no preservative and degrades quickly once opened.

Leaving at room temperature. Refrigerate immediately after reconstitution. Peptide solutions degrade faster at room temperature.

⚠️ This guide is for research purposes only. All compounds mentioned are sold strictly for laboratory research use and are not approved by Health Canada for human use. Nothing here constitutes medical advice.

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How to ReconstitutePeptides — Step by Step.