Buy BAC Water Australia

Bacteriostatic water (BAC water) is available in Australia from Peptide Warehouse Australia (auspeptidewarehouse.com.au), an Australian-owned research supplier based in Melbourne. We stock BAC water as 10mL pharmaceutical-grade vials with 0.9% benzyl alcohol, dispatched Australia-wide via Australia Post with full tracking. Orders placed before 12PM AEST dispatch the same business day from our Melbourne warehouse. One 10mL vial is enough to reconstitute multiple peptide vials, and it ships alongside any peptide order.

Bacteriostatic water is sterile water for injection containing 0.9% benzyl alcohol as a preservative. It is the standard diluent for reconstituting lyophilised peptides in laboratory research. The benzyl alcohol inhibits bacterial growth, making the vial safe for multiple uses without contamination between withdrawals — critical in research settings where a single peptide vial may be accessed multiple times over days or weeks. Do not use regular water, distilled water, or saline — these lack the preservative and cannot safely support multi-use access. One 10mL vial is sufficient for reconstituting multiple peptide vials.

BAC Water 10mL is $19.99 AUD per vial at Peptide Warehouse Australia. A single 10mL vial reconstitutes multiple peptide vials, so most research protocols only need one. It pairs with 31G insulin syringes for precise transfer — see /products/insulin-needles-31g. Free standard shipping applies once your order passes the free-shipping threshold, so adding BAC water to a peptide order is an efficient way to reach it.

The volume of BAC water determines your working concentration. Common ratios: 1mL BAC water into a 10mg peptide vial = 10mg/mL (10,000 mcg/mL); 2mL into 10mg = 5mg/mL; 5mL into 10mg = 2mg/mL. For a 50mg peptide vial: 5mL BAC water = 10mg/mL. Choose your volume based on the concentration your research protocol requires. One 10mL vial of BAC water can reconstitute multiple peptide vials. See our /blog/how-to-reconstitute-peptides guide for a full concentration table.

Unopened BAC water can be stored at room temperature (15–25°C), protected from light, with a typical sealed shelf life of 2–3 years from manufacture. Once opened (first needle puncture), refrigerate at 2–8°C and use within 28 days — the standard multi-dose vial usage period for bacteriostatic preparations. The benzyl alcohol preservative maintains sterility within this window. Do not freeze BAC water. Always use a new sterile needle each time you access the vial to prevent introducing contamination that could overwhelm the preservative.

The critical difference is the preservative. Sterile water for injection (SWFI) contains only water — no benzyl alcohol or other preservatives. Once the vial seal is punctured, SWFI must be used immediately or discarded, as it has no defence against microbial contamination from repeat needle access. BAC water contains 0.9% benzyl alcohol, which maintains bacteriostasis for 28 days post-opening. For research protocols requiring multiple withdrawals over days or weeks, BAC water is the appropriate choice. SWFI is appropriate only for single-use reconstitutions where the entire vial is used immediately.

Yes — this is the primary advantage of bacteriostatic water over sterile water for injection. The 0.9% benzyl alcohol preservative allows the vial to be accessed multiple times with a sterile needle over the 28-day post-opening period while maintaining bacteriostatic conditions. Each withdrawal must be made with a fresh, sterile 31G needle (available at /products/insulin-needles-31g) — never reuse a needle that has been used elsewhere, as this is the primary route by which contamination would be introduced. The vial septum is designed to reseal after each needle withdrawal.

Orders placed before 12PM AEST on a business day are dispatched the same business day from our Melbourne warehouse via Australia Post with full tracking. Orders after 12PM AEST dispatch the next business day. Standard Post (2–6 business days) is $8.99; Express Post (1–3 business days) is $13.99. Free standard shipping on orders over $199 AUD. All packages are sent in plain discreet packaging with no external branding.