Bacteriostatic Water

Bacteriostatic water is sterile water containing 0.9% benzyl alcohol as a bacteriostatic preservative. In the laboratory it is the standard diluent for reconstituting lyophilised research peptides: the benzyl alcohol inhibits bacterial growth, which is why a reconstituted stock prepared with it has a longer usable window than one prepared with plain sterile water.

That depends on the concentration you want, not on the vial itself. Concentration equals the vial mass divided by the volume of diluent added, so a 10mg vial reconstituted in 2mL gives 5mg/mL, and the same vial in 1mL gives 10mg/mL. Our reconstitution calculator works out the concentration and corresponding volumes for any vial size.

Sterile water contains no preservative, so a solution prepared with it is intended for immediate single use. Bacteriostatic water contains 0.9% benzyl alcohol, which inhibits bacterial growth and allows a prepared stock to be drawn from repeatedly over a longer working window when stored correctly.