Sterile water preserved with 0.9% benzyl alcohol — the standard diluent for reconstituting lyophilised research material. Held in Ireland, dispatched tracked from inside the EU. Supplied for laboratory research use only.
Sterile water preserved with 0.9% benzyl alcohol — the laboratory standard for reconstitution. Sold in the sizes that fit the in-use window rather than the sizes that look cheapest per millilitre.
Bacteriostatic water is sterile water containing 0.9% benzyl alcohol as a preservative. The benzyl alcohol is the whole point: it is what makes the water bacteriostatic, suppressing microbial growth so a vial can be accessed more than once over a working window instead of being a single-use ampoule. In a laboratory setting it is the standard diluent for reconstituting lyophilised (freeze-dried) peptides and other powdered reagents into a stock solution. It is a consumable, not a compound, and it is supplied here for research use only.
Two channels exist for most buyers, and each has a catch. Pharmacies do not generally carry it as a shelf item, and the nearest pharmacy-channel products are prescription-only. General marketplaces list it, but those listings routinely ship from outside the EU — which introduces a customs step, a delay, and delivery charges that can exceed the price of the item itself.
We hold it in Ireland in two sizes, priced at €5.99 and €8.99, and dispatch it tracked from inside the EU. An intra-EU parcel is not presented to customs the way an import is, which is the practical difference for anyone who has had a parcel sit at a border.
Once a vial is opened, the preservative gives it a practical multi-use life commonly cited as up to 28 days kept refrigerated between uses. Unopened vials keep far longer per the labelled date. That window is why bacteriostatic water behaves like a recurring supply rather than a one-off purchase — and why buying a very large vial is usually a false economy. You cannot extend the window by buying more of it at once.
That depends on the mass in the vial and the concentration a protocol calls for, which is arithmetic rather than judgement. The reconstitution calculator does it: enter the vial size and the target, and it returns the volume of water to add and the volume to draw. The reconstitution & storage guide covers the general handling procedure around it — how to add the diluent, and how the resulting solution should be stored.
It is not normally stocked on pharmacy shelves, and the closest pharmacy-channel products are prescription items. PowerfullyPeptides stocks it as a laboratory consumable in 3 mL and 10 mL vials and dispatches it tracked from inside the EU, so an Irish or EU order is not held at a customs border the way a parcel from outside the EU can be.
In a laboratory setting it is the standard diluent for reconstituting lyophilised (freeze-dried) research peptides and other powdered reagents into a stock solution. It is supplied strictly for research use.
Sterile water for injection contains no preservative and is intended for a single use. Bacteriostatic water adds 0.9% benzyl alcohol, which suppresses microbial growth and is what allows a vial to be accessed multiple times across its in-use window.
The preservative gives an opened vial a practical multi-use life commonly cited as up to 28 days when kept refrigerated between uses. Unopened vials keep far longer, per the date on the label. That 28-day window is why researchers tend to treat it as a recurring supply rather than a one-off purchase.
Because of the same 28-day in-use window. A larger vial does not extend the window — it usually means paying for volume that passes its in-use date before it is used. Two 10 mL vials bought a month apart are generally more useful than one 30 mL vial, which is why the sizes here are deliberately small.
Ask the same questions you would ask about any laboratory consumable: who supplied it, what the vial states, and whether the seller will tell you. Marketplace listings for this item routinely ship from outside the EU with a delivery charge that can exceed the price of the item itself, and no supply chain you can inspect. Our general method for checking a supplier is published on our How to Verify a Supplier page and is written to be used on us too.
For research use only. Bacteriostatic water supplied by PowerfullyPeptides is a laboratory consumable provided strictly for research purposes. It is not for human, veterinary, diagnostic or therapeutic use. This page describes a laboratory reagent and the practicalities of buying one; it is not medical, health or usage guidance, and nothing on it should be read as such.
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