Bacteriostatic Water at Chemist Warehouse: Do Australian Chemists Stock It?

Does Chemist Warehouse sell bacteriostatic water?

At the time of writing (September 2026), searches of Chemist Warehouse's online catalogue did not return a bacteriostatic water product. The injectables-adjacent items that do appear are things like insulin syringes and prescription ampoules, not preserved diluent vials. The same pattern holds across the other big retail chains: bacteriostatic water is not a standard over-the-counter line in Australian retail pharmacy.

That is not surprising once you look at what the product is. Bacteriostatic Water for Injection is a pharmaceutical diluent: sterile water with benzyl alcohol added as a preservative, sold in hospital and clinic channels. Pfizer's US product, for example, is labelled "Rx only" and "NOT FOR USE IN NEONATES" because of benzyl alcohol toxicity in newborns. Retail chemists stock what walks out the door, and a multi-dose diluent vial has almost no retail demand from the general public.

Stock changes, so if you want a definitive answer for a particular store, ring the dispensary. AminoBlend has no affiliation with Chemist Warehouse or any pharmacy chain, and nothing here describes their policies beyond what their public website showed when we checked.

What an Australian chemist near me can supply instead

The product pharmacies can supply is Water for Injections BP: sterile, pyrogen-free water with no preservative at all. It is on the Australian Register of Therapeutic Goods (ARTG) under several sponsors, including 10 mL plastic ampoules from Pfizer, and healthdirect lists it as not scheduled under the Poisons Standard. Pharmacies and medical suppliers commonly sell the 10 mL ampoule, and some can order 2 mL, 5 mL and 20 mL sizes.

The catch is in the word ampoule. Water for Injections is a single-use product: once the ampoule is snapped open, whatever you do not draw up is meant to be discarded. It has no benzyl alcohol, so nothing stops microbes multiplying if you try to keep it. For a lab that reconstitutes a peptide vial and then draws from it over several weeks, that is the wrong tool. Our guide to bacteriostatic water vs sterile water sets out the differences side by side.

Where can I buy bacteriostatic water in Australia?

Most researchers in Australia buy bacteriostatic water from the same place they buy their peptides. There are practical reasons for that beyond availability. Peptide suppliers size their diluent to match the vials they sell, so you are not forced into a 30 mL vial for a single 5 mg peptide. And the supplier can tell you which diluent a given compound needs, which a retail pharmacist has no reason to know for a research peptide.

AminoBlend sells bacteriostatic water in 3, 10 and 30 mL vials, each also available with one sterile U-100 syringe.

If you are comparing suppliers, check the fill volume, the stated benzyl alcohol concentration and the expiry date on the label. A vial carrying a short expiry date is a waste, because the 28-day clock starts at first puncture regardless of how long the vial has been sitting in a warehouse.

Which size to buy (our recommendation)

Buy the smallest vial you will actually finish inside 28 days. That is the single most useful piece of advice we can give on bac water, and the most common mistake we see is the opposite: one 30 mL vial bought to reconstitute a single 10 mg peptide, with 28 mL poured out a month later.

• 3 mL: one or two peptide vials at a time, which is the size most single-compound projects should buy.
• 10 mL: for a lab preparing several different peptides in the same month, such as a skin and cellular peptide alongside a metabolic compound.
• 30 mL: high-throughput work only, where the whole vial is used inside the 28-day window.

Our peptide reconstitution calculator shows how much water a given fill needs for a target concentration, which tells you how many vials a bottle of diluent will cover before you order.

When bacteriostatic water is not the right diluent

Not every compound should go into bacteriostatic water. A few peptides dissolve poorly at the near-neutral pH of plain water and are usually reconstituted in dilute acid instead. IGF-1 LR3 is the textbook case, and that is what 0.6% acetic acid is for. A handful of protocols also call for preservative-free water because benzyl alcohol interferes with a specific assay. If your method specifies a diluent, follow the method rather than a general rule.

For everything else, bacteriostatic water is the default. The full step-by-step procedure, including how to add water down the side of the vial rather than onto the powder, is in our peptide reconstitution guide.

Skip the Chemist: Order Bacteriostatic Water Online for the Lab

A chemist near me search is unlikely to turn up a multi-draw vial, so the simplest route is to buy bacteriostatic water online alongside the peptides it will dissolve. Our bacteriostatic water listing holds 3, 10 and 30 mL vials in Australian stock from $9, and each size can come with a matching U-100 syringe for $3 more. Researchers preparing a stubborn compound such as IGF-1 LR3 can drop a vial of 0.6% acetic acid into the same cart, and a lab short on measuring gear can pick up a 30 pack of sterile insulin syringes for $20. Shop the diluent first, add the peptide, and place one order; the rest of the consumables sit in the water and supplies category.

AminoBlend sells bacteriostatic water and all other products for laboratory research use only. They are not for human or veterinary use, and nothing in this guide is medical advice.