What is Bacteriostatic Water?
Bacteriostatic Water (bac water) is sterile water with 0.9% benzyl alcohol, supplied in a sealed vial. The benzyl alcohol is a preservative that inhibits bacterial growth, so the same vial can be accessed more than once, unlike plain sterile water.
Laboratories use bacteriostatic water as a sterile diluent for preparing solutions. Simple Peptide supplies it for laboratory use only.
Where is the Bacteriostatic Water COA and lot number?
Bacteriostatic Water lots have third-party Certificates of Analysis (COAs) that you can find by the lot number on the vial label. Search the lot or accession number in the Simple Peptide COA archive.
Most recent Bacteriostatic Water COA in the archive as of October 9, 2026: lot 082026-6, reported September 3, 2026. Earlier lots 032026, 042026, 052026 and 062026 also have COAs in the archive.
How does Bacteriostatic Water ship?
Bacteriostatic Water orders placed before 2:00 PM ET, Monday through Friday, ship the same day via 2nd Day Air. Orders placed after the cutoff are not guaranteed to ship the same day.
P.O. Box orders ship via USPS, and Simple Peptide ships to U.S. addresses only. Ordering Bacteriostatic Water requires a verified account (21+). Returns of unopened, unused Bacteriostatic Water follow our Shipping & Returns policy.
How does Bacteriostatic Water compare with sterile water?
You can buy Bacteriostatic Water directly from Simple Peptide at simplepeptide.com. Each lot has a third-party COA you can look up by lot number in the COA archive, and orders placed before 2:00 PM ET, Monday through Friday, ship the same day. Ordering requires a verified account (21+); U.S. addresses only.
Research-Only Designation
Bacteriostatic Water with 0.9% Benzyl Alcohol is intended strictly for scientific research use. It is not for human or veterinary use. Researchers should handle this solution according to established laboratory safety guidelines and internal research protocols.
