Bacteriostatic water for injection is sterile water containing 0.9% benzyl alcohol as a preservative. The benzyl alcohol provides bacteriostatic activity, allowing repeated punctures of a single vial without supporting microbial growth between uses.

It is widely used in research and pharmaceutical settings as a diluent for the reconstitution of lyophilized peptides and other dry pharmaceutical compounds. The bacteriostatic property distinguishes it from sterile water for injection, which is preservative-free and intended for single use.

It is not a research compound in itself but a reconstitution solvent.

For research purposes only. Not for human consumption.