Bacteriostatic water (BAC water) is sterile water for injection that contains 0.9% benzyl alcohol as a bacteriostatic preservative. The preservative inhibits the growth of bacteria, which is what allows a sealed multi-dose vial to be entered with a sterile needle repeatedly — typically over a 28-day in-use window — without the remaining contents losing sterility. That single property is what separates bacteriostatic water from preservative-free sterile water, which is single-use.
In the laboratory, bacteriostatic water is the standard diluent for reconstituting lyophilized research materials, because the same vial can be re-entered across multiple research sessions. Our 10 mL multi-dose bacteriostatic water is sterile-filtered, USP-grade, made with 0.9% benzyl alcohol, and documented down to the lot. We hold consistent inventory and ship same business day before 2pm PST from Las Vegas — built to stay in stock through the recurring bacteriostatic water shortages that leave thinner sellers out of stock.
For laboratory and research use only. Not for human or veterinary use, and not a drug, supplement, or medical device.