Reconstitution Guide & Storage

Reconstitution is the process of turning a lyophilised (freeze dried) peptide into a usable liquid solution. Doing it correctly protects the peptides integrity and ensures accurate, consistent concentrations.

This guide walks through the process step by step.

Disclaimer: This guide is for informational purposes for research and handling only. It is not medical advice and does not cover dosing for human or animal use.

What you will need

  • Lyophilised peptide vial
  • Bacteriostatic water (BAC water)
  • Alcohol Swabs
  • Syringes (A fine-gauge insulin syringe for mixing/measuring is common)
  • A calculator or reconstitution calculator tool

Why Bacteriostatic water?

Bacteriostatic water is sterile, non-pyrogenic water containing 0.9% benzyl alcohol, which acts as a preservative, which inhibits bacterial growth allowing the vial to be accessed multiple times over several days or weeks.

Sterile water lacks this preservative and is typically intended for single, immediate use and discarded after initial use.

Step 1: Calculate Your Concentration

Before drawing any liquid, decide how much bacteriostatic water to add based on:

  • The total peptide amount in the vial (e.g. 5mg – 10mg)
  • The concentration you want per unit volume

Example: adding 2ml of Bacteriostatic water to a 10mg vial gives a concentration of 5mg/ml

More water = Lower concentrate per ml (more volume needed per unit)
Less water = Higher concentrate per ml (less volume needed per unit)

Choose an amount that lets you measure practically on your syringe’s markings for your dosage requirement.

Step 2: Prepare Your Workspace

  • Wash your hands thoroughly.
  • Wipe down your work surface with an alcohol swab
  • Let the peptide vial and water reach room temperature if either were refrigerated – this reduces the stress on the peptide structure during mixing

Step 3: Sanitise the Vials

  • Remove the vial safety cap (Closure) and wipe the rubber stopper of both the peptide vial and bacteriostatic water vial with a fresh alcohol swab.
  • Let the alcohol air-dry for a few seconds before proceeding

Step 4: Draw the Water

  • Draw air into the syringe equal to the amount of water you plan to withdraw
  • Insert the needle into the water vial and inject the air (this equalises pressure and makes withdrawal easier)
  • Invert the vial and draw out your calculated volume of bacteriostatic water

Step 5: Add Water to the Peptide Vial

  • Insert the needle through the peptide vials rubber stopper at an angle
  • Aim the needle so that the water runs slowly down the inside wall of the vial and NOT directly onto the lyophilised powder.
  • Slow and gentle addition prevents excess foaming and minimizes distruption to the peptides structure.

Step 6: Let It Dissolve

  • Do not shake the vial. Shaking can denature (damage) the peptide by breaking it's structure bonds.
  • Instead, gently swirl the vial or let it sit undisturbed. Most peptides dissolve within a few minutes
  • If it’s slow to dissolve, gently roll the vial between your palms.

Step 7: Inspect the Solution

The reconstituted liquid should be clear and free of particles or cloudiness (unless the specific peptide is known to naturally reconstitute with slight opacity)

Common Mistakes to Avoid

  • Shaking the vial instead of swirling gently
  • Injecting water directly onto the powder at high force
  • Using expired or non-sterile water
  • Skipping alcohol swabbing of stoppers before each use
  • Guessing at concentration levels instead of calculating it precisely and gaining knowledge on volume to use
  • Reusing needles across multiple draws (increases contamination risk)

Storage Guidelines

Temperature

Refrigerate at 2-8 degrees centigrade

Light exposure

Store in original box or wrap in foil – Many peptides are light sensitive

Typical stability window

Varies by peptide - commonly a few weeks refrigerated

Freezing

Not recommended after reconstitution as freeze-thaw cycles can degrade peptides