Bacteriostatic water (BAC water) is sterile water preserved with 0.9% benzyl alcohol — the industry-standard diluent for reconstituting lyophilized (freeze-dried) peptides and research compounds in laboratory settings. The benzyl alcohol acts as a bacteriostatic agent, inhibiting microbial growth and allowing the solution to remain stable after initial opening, which is important for multi-use research vials.

In peptide reconstitution protocols, the choice of diluent matters. Unlike plain sterile water, bacteriostatic water resists contamination over multiple draw cycles, making it the preferred choice for researchers working with lyophilized peptides that require repeated sampling. It is chemically inert and does not react with standard peptide compounds.

BAC water is used across a wide range of research disciplines — from endocrinology and peptide biology to pharmacology. Any lab working with freeze-dried peptide compounds will typically include bacteriostatic water as a core consumable in their reconstitution workflow.

myPEPT supplies bacteriostatic water in clearly labeled, sealed vials at research-grade standard. Each batch is verified for sterility and benzyl alcohol concentration, and we ship across the EU with the documentation needed for lab intake.

What researchers should know: This product is a laboratory diluent intended for use in research settings. It is not for injection into humans or animals outside of approved clinical or veterinary contexts. Always follow your institution's protocols when handling sterile materials.