# How to reconstitute a peptide

> Source: https://peptidestogo.com/guides/reconstitution/
> PRACTICAL GUIDE
> Last updated: June 29, 2026 · 6 min read

Most peptides ship as a freeze-dried (lyophilized) powder that you mix with bacteriostatic water before the first injection. Here's the procedure, the ratios that matter, and how to turn your prescribed dose into syringe units.

## What you'll need

### On the table before you start

- Your peptide vial (lyophilized powder)
- Bacteriostatic water (not sterile water — the benzyl alcohol keeps a multi-dose vial usable for weeks)
- A reconstitution syringe (often 1–3 mL) and an insulin syringe for dosing
- Alcohol swabs and a clean, flat surface

## Step by step

**Let everything reach room temperature.** Cold vials and cold water draw poorly and can shock the peptide.

**Swab both stoppers.** Wipe the rubber top of the peptide vial and the water vial with alcohol and let them dry.

**Draw your bacteriostatic water.** Pull the volume your protocol calls for into the reconstitution syringe.

**Add it slowly, down the glass wall.** Angle the needle so the water runs down the side of the vial rather than landing directly on the powder. This protects the peptide’s structure.

**Don't shake — swirl.** Roll or gently swirl the vial until the powder dissolves. Shaking can denature peptides. A little patience beats foam.

**Inspect.** The solution should be clear. Discard it if it’s cloudy, discolored, or has particulate.

**Refrigerate.** Once mixed, most peptides live in the fridge (2–8 °C) and are used within the window your pharmacy specifies — commonly 14–30 days.

## The ratio that matters

There's no single "correct" amount of water — it sets the *concentration*, which sets how many syringe units a dose becomes. More water = more dilute = larger, easier-to-measure draws. Less water = more concentrated = tiny draws. The goal is a dose that lands in a comfortable, readable range on your insulin syringe.

Rather than eyeball it, plug your numbers in:

## Storage & handling

- Keep reconstituted peptides refrigerated and out of light.
- Never freeze a reconstituted vial unless your pharmacy explicitly says to.
- Label the vial with the mix date so you don't outrun its stability window.
- One vial, one person, one clean needle per injection.

## Where this fits

Reconstitution is mechanical; **dosing is medical**. The amount, frequency, and length of any protocol belong with your licensed prescriber — this guide only covers how to mix and measure what they've prescribed.

For the deeper pharmacology and study-by-study detail, see the independent breakdowns on our hub, [PeptideWellness](https://peptidewellnessusa.com/learn/).

This guide is educational and not medical advice. See our [Medical Disclaimer](https://peptidestogo.com/legal/medical-disclaimer/).