How to Reconstitute Peptides with Bacteriostatic Water
A clear, step-by-step research guide to reconstituting lyophilised peptides with bacteriostatic water — the right technique, ratios, and storage afterwards.
Why Peptides Come as Powder
Research peptides are supplied as a lyophilised (freeze-dried) powder because they are far more stable in that form. Before they can be used in a research setting, the powder is reconstituted — dissolved into a liquid — using bacteriostatic water.
Getting this step right matters: poor technique can denature a peptide or introduce contamination, undoing the quality you paid for.
What You Need
- A vial of lyophilised peptide
- Bacteriostatic water (sterile water with 0.9% benzyl alcohol, which inhibits bacterial growth)
- A sterile syringe
- Alcohol swabs
Bacteriostatic water is the standard choice because the benzyl alcohol preservative allows a reconstituted vial to be stored and used over several weeks. It is available at peptidesandyou.com/product/bac-water.
Step by Step
- Sanitise — Swab the rubber stopper of both the peptide vial and the bacteriostatic water vial with alcohol.
- Draw the water — Pull your chosen volume of bacteriostatic water into the syringe.
- Add slowly — Insert the needle into the peptide vial and let the water run gently down the inside wall of the glass. Never spray it directly onto the powder, as force can damage the peptide.
- Do not shake — Swirl the vial gently until the powder dissolves. Shaking can break the delicate peptide bonds.
- Inspect — A correctly reconstituted solution should be clear. Cloudiness can indicate a problem.
Choosing Your Ratio
The amount of water you add determines concentration, not the total amount of peptide present. More water simply makes the solution more dilute. Researchers choose a ratio that makes their intended measurements convenient and consistent.
After Reconstitution
Once mixed, store the vial refrigerated. For longer-term handling and shelf-life guidance, see our peptide storage guide. Every product reconstituted from a Peptides & You vial is lab tested with a Certificate of Analysis — view results at peptidesandyou.com/lab-results.
For laboratory and research use only. Not for human or veterinary consumption. These statements have not been evaluated by the U.S. FDA or the Philippine FDA.