Guide
Bacteriostatic Water vs Sterile Water
The chemistry difference between bacteriostatic and sterile water, why 0.9% benzyl alcohol matters for multi-use vials, and how each affects storage windows.
The difference in one line
Sterile water is water with nothing in it. Bacteriostatic water is sterile water containing 0.9% benzyl alcohol, a preservative that inhibits microbial growth after the stopper has been pierced.
Practical consequences
| Sterile water | Bacteriostatic water | |
|---|---|---|
| Preservative | None | 0.9% benzyl alcohol |
| Vial entries | Single use | Multi-use |
| Typical in-use window | Same session | Commonly documented at 28 days refrigerated |
| Suitable for multi-draw research vials | No | Yes |
Selecting a diluent volume
Volume choice sets the concentration, and concentration sets how precisely you can measure. Choose a volume that places your target amount between 10 and 50 units on a U-100 syringe — that is the band where the graduations are most readable. The peptide calculator will do the arithmetic.
Handling notes
Swab both stoppers with alcohol before every entry, never re-enter a vial with a used needle, label the vial with the concentration and reconstitution date, and hold reconstituted material at 2–8 °C protected from light.
Research use only. PX1 Research supplies compounds for laboratory and in-vitro research. Nothing on this page is medical advice, a dosing recommendation, or an offer for human or veterinary use.