Bacteriostatic Water (BAC)

Global Peptide Sciences supplies Bacteriostatic Water for laboratories across Australia, formulated as a sterile diluent for reconstituting lyophilised research peptides and other freeze-dried compounds ahead of experimental work.

It is worth clarifying from the outset that Bacteriostatic Water is not a peptide. It is a sterile aqueous solution containing 0.9% benzyl alcohol as a preservative agent, which inhibits bacterial growth across repeated withdrawals from the same vial. Plain sterile water contains no such preservative and is generally intended for a single use only, which is the key distinction between the two.

Every batch is produced under controlled, GMP-aligned manufacturing conditions and verified through independent laboratory testing before release. A Certificate of Analysis is available on request for each order.

What Is BAC Water Used For?

Researchers frequently ask what BAC water is used for in a laboratory context. Its primary role is as a diluent: reconstituting lyophilised powders, including research peptides, so they can be handled, measured, and studied in solution rather than as a freeze-dried compound.

Because it contains benzyl alcohol, a single vial of BAC water can generally support multiple reconstitution events rather than being discarded after one use, provided it is stored correctly and handled under sterile conditions in line with standard laboratory practice.

Sterile Bacteriostatic Water: Composition and Properties

Sterile bacteriostatic water is a straightforward formulation: purified water combined with 0.9% benzyl alcohol, manufactured under controlled conditions and checked through independent laboratory verification prior to release. Within research and supplier documentation, the same solution is often shortened to simply BAC water, or described by its active preservative component as a Benzyl Alcohol Solution.

It is also worth noting that this product is sometimes searched for under the misspelling bacterialistic water. The correct term used in pharmacopoeial and scientific literature is bacteriostatic water, and researchers sourcing documentation or safety data should search under that spelling.

How Long Does BAC Water Last?

A question we hear often is how long BAC water lasts once a vial has been opened. General pharmacopoeial guidance typically points to a limited in-use stability window following first access, provided the solution is kept refrigerated and handled under sterile conditions throughout.

That said, Global Peptide Sciences recommends that laboratories rely on their own internal protocols and documentation standards when determining in-use stability for a specific study, rather than defaulting to general supplier guidance alone.

Product Information

• Compound: Bacteriostatic Water (0.9% Benzyl Alcohol)
• Classification: Sterile diluent solution
• Composition: Purified water with 0.9% benzyl alcohol
• Form: Sterile liquid solution, supplied in vials
• Quality: Pharmaceutical-grade, third-party verified
• Testing: Independent laboratory verification, Certificate of Analysis available on request
• Storage: Store between 2°C and 25°C. Do not freeze.

Research Applications

Commonly referenced in laboratory research for:

• Reconstitution protocols for lyophilised research peptides
• Stability assessment of freeze-dried compounds
• Preparation of controlled solutions for experimental dosing
• Handling and storage studies involving injectable-grade research liquids

Chemical Structure

• Molecular Formula: Sterile Water for Injection with 0.9% Benzyl Alcohol
• Molecular Weight: Not applicable
• Purity: USP-grade sterile filtration standard
• Appearance: Clear, colourless sterile liquid
• Storage: Store at 2°C to 25°C. Do not freeze.
• Form: Transparent liquid solution

Key Characteristics

• Multi-dose preservative content (0.9% benzyl alcohol)
• Sterile-filtered for laboratory use
• Compatible with lyophilised peptide reconstitution
• Suitable for repeated withdrawals when handled under sterile conditions

Why Researchers Use Bacteriostatic Water

Laboratories working with lyophilised research compounds tend to prefer Bacteriostatic Water over preservative-free sterile water precisely because of its multi-use stability. A single vial can support several reconstitution events across a study rather than being opened and discarded each time, which simplifies handling for laboratories running multiple preparations from the same batch.

It is commonly ordered alongside a wide range of research peptides as part of the same reconstitution workflow. Researchers building out a broader order can review the full range of research peptides available through Global Peptide Sciences to source compatible materials from the same verified supply chain.

Where to Buy BAC Water in Australia

For laboratories asking where to buy BAC water in Australia, Global Peptide Sciences supplies it directly, with every batch backed by independent verification and documentation available on request.

Researchers looking to buy bacteriostatic water in Australia, or specifically to buy BAC water in Australia alongside a research peptide order, can do so through secure online ordering, with same-day dispatch from our Perth facility. Those who prefer to purchase BAC water as a standalone item, separate from a peptide order, are welcome to do so as well.

This product is supplied strictly for laboratory research purposes and is not approved for human or animal consumption.

Research Use Only

This compound is supplied strictly for laboratory research purposes and is not approved for human consumption or therapeutic use.