Frequently Asked Questions About Bacteriostatic Water

Bacteriostatic water is sterile water that contains 0.9% benzyl alcohol as a preservative. The benzyl alcohol inhibits the growth of bacteria, which allows the water to be used multiple times from the same vial without contamination. It is USP-grade and commonly used in research settings for reconstituting lyophilized (freeze-dried) peptides and other compounds.

Bacteriostatic water is primarily used to reconstitute (dissolve) lyophilized peptides, medications, and other powdered compounds. It serves as a safe, sterile diluent that preserves the solution for multiple uses thanks to its benzyl alcohol content. Researchers use it when they need a reliable solvent that won't introduce bacterial contamination into their work.

The key difference is the preservative. Bacteriostatic water contains 0.9% benzyl alcohol, which prevents bacterial growth and allows multi-dose use. Sterile water for injection contains no preservative and is intended for single use only — once opened, it must be discarded. For peptide reconstitution where you'll draw from the same vial multiple times, bacteriostatic water is the correct choice.

Unopened bacteriostatic water should be stored at controlled room temperature (68-77°F / 20-25°C) away from direct sunlight. Once opened and used for reconstitution, the mixed peptide solution should typically be refrigerated at 36-46°F (2-8°C) to maintain peptide stability. The bacteriostatic water vial itself does not require refrigeration but should be kept in a cool, dry place.

Unopened bacteriostatic water typically has a shelf life of 2-3 years from the date of manufacture when stored properly. Once the vial has been punctured, it should be used within 28 days according to USP guidelines. The benzyl alcohol preservative keeps the water safe for multi-dose use during that 28-day window, but beyond that, sterility can no longer be guaranteed.

Yes. Bacteriostatic water does not require a prescription and is available for purchase over the counter and online. At BacWater Plus, we offer USP-grade bacteriostatic water in both 10mL and 30mL vials with same-day shipping.

You can purchase high-quality, USP-grade bacteriostatic water right here at BacWater Plus. We offer 10mL vials and 30mL vials with fast, discreet shipping nationwide. Orders placed before 2 PM EST ship the same day. We also offer free shipping on orders over $50.

Reconstituting peptides is straightforward: (1) Swab the tops of both the peptide vial and bacteriostatic water vial with alcohol. (2) Draw the desired amount of bacteriostatic water. (3) Inject it slowly into the peptide vial, aiming the stream against the glass wall — never directly onto the powder. (4) Gently swirl (do not shake) until dissolved. For a detailed walkthrough, see our complete peptide reconstitution guide.

It depends on your needs. A 10mL vial is perfect if you are reconstituting a single peptide vial or want a smaller quantity. The 30mL vial offers better value per milliliter and is ideal if you are working with multiple peptides or need a larger supply. Remember that once punctured, a vial should be used within 28 days.

Yes. We offer volume pricing on larger orders of bacteriostatic water. Whether you are stocking up for extended research or purchasing for a clinic or lab, bulk orders come with reduced per-unit pricing. Check our 30mL product page for multi-pack options, or contact us directly for custom wholesale pricing on larger quantities.

Store unopened vials at room temperature (68-77°F / 20-25°C) in a cool, dry place away from direct sunlight and heat sources. Do not freeze bacteriostatic water. Once opened, keep the vial clean by always swabbing the stopper with alcohol before each use, and use the contents within 28 days. For reconstituted peptide solutions, refrigeration is typically recommended.

Yes, BacWater Plus ships to all 50 U.S. states. Orders placed before 2 PM EST Monday through Friday are shipped the same day. Standard delivery takes 2-3 business days. All orders are shipped in discreet, insulated packaging to protect product quality. We also offer free shipping on orders over $50. See our full shipping policy for details.