Compare prices and buy Bacteriostatic Water from 39 research peptide vendors - also called suppliers or sources. Updated daily.
A sterile water solution preserved with 0.9% benzyl alcohol, sold by research-peptide vendors as a diluent for lyophilized peptides. The benzyl alcohol inhibits microbial growth, which lets a multiple-dose vial be entered more than once, and its beyond-use date after opening is a sterility limit for the diluent alone. The Hospira label warns against use in neonates and notes that some drugs may be incompatible with a vehicle containing benzyl alcohol. For research purposes only.
For research purposes only. Not medical advice.
Bacteriostatic water is not a peptide. PeptideScouter catalogues it because research-peptide vendors sell it alongside the lyophilized vials it is used to dissolve.
The USP monograph defines bacteriostatic water for injection (BWFI) as sterilized water for injection containing one or more suitable antimicrobial agents. Hospira's approved product uses benzyl alcohol, 0.9% (9 mg/mL) in its 30 mL plastic vial. Benzyl alcohol does not kill bacteria already in the vial (sterilization at the manufacturer handles that) but inhibits the growth of new contaminants introduced during repeated punctures of the rubber stopper. This is the property that makes bacteriostatic water suitable for multi-dose use, distinguishing it from sterile water for injection, which is preservative-free and intended for single use only. CDC notes that the preservative has no effect on viruses and does not give complete protection against bacterial contamination.
Sterile water for injection (SWFI) is pyrogen-free water with no preservative, packaged in single-dose containers and discarded after one use. Bacteriostatic water is the same sterile water with a preservative added, and Hospira supplies it in multiple-dose vials. The USP monograph requires its label to carry the statement "Not For Use In Newborns", and Hospira's label says only preservative-free sterile water for injection should be used to prepare medications for neonates.
USP Chapter <797> assigns multi-dose containers of preserved sterile injectables a 28-day beyond-use date once the rubber stopper is first punctured, unless the manufacturer states another date, and never past the printed expiration date. The 28-day date is a sterility limit for the diluent and says nothing about how long a dissolved peptide stays intact. Hospira's label also says not to store a drug reconstituted in it unless the drug's own manufacturer directs otherwise. After 28 days from first puncture, USP-compliant practice is to discard the remaining vial.
Hospira, a Pfizer company, makes bacteriostatic water for injection under NDA 018802, which Drugs@FDA lists as the only active application for the product. Its 30 mL plastic vial and the unbranded bacteriostatic water sold by research vendors are both sold as 0.9% benzyl alcohol in sterile water. PeptideScouter indexes Hospira-branded and unbranded bacteriostatic water as separate rows, and each page shows its live prices.
The Hospira label warns that some drugs may be incompatible with a vehicle containing benzyl alcohol, so compatibility is product-specific. The FDA-approved hCG products Novarel and Pregnyl both supply a diluent with 0.9% benzyl alcohol, and a 2023 review of preservatives counts hCG among the licensed drugs formulated with it. Bachem, a peptide manufacturer, ties solubility mainly to charge. Peptides with more basic than acidic groups may dissolve in a dilute acid such as acetic acid, and acidic peptides in a dilute base. The acetic acid page sets out which compounds have a documented solvent.
No. Bacteriostatic water contains a preservative, 0.9% benzyl alcohol in the products indexed here, while sterile water for injection (SWFI) is preservative-free. Sterile water is single-use only, but its preservative allows repeated entry, and USP <797> gives an opened vial a 28-day beyond-use date, a sterility limit for the diluent alone.
USP Chapter <797> assigns a 28-day beyond-use date to multi-dose preserved sterile injectables once the rubber stopper is first punctured, unless the manufacturer states another date, and never past the printed expiration date. That date is a sterility limit for the diluent and says nothing about how long a dissolved peptide stays intact.
Both are sold as 0.9% benzyl alcohol in sterile water. The difference is the maker: Hospira, a Pfizer company, holds NDA 018802, which Drugs@FDA lists as the only active application for bacteriostatic water for injection. PeptideScouter indexes the two as separate rows, and each page shows its live prices.
Research peptides are sold lyophilized (freeze-dried) and require dissolution in a sterile diluent before further work. Its preservative lets one vial be entered repeatedly, which single-dose sterile water does not allow. The 28-day limit after first puncture is a sterility date for the diluent and says nothing about how long a dissolved peptide stays intact.
For single-use applications, yes. SWFI is the preservative-free single-dose equivalent. Where a product's documentation rules out benzyl alcohol, sterile water is the preservative-free alternative. Acetic acid water serves a different purpose, as a dilute acid for basic peptides that dissolve poorly in water. Hospira's sterile water label supplies it only in single-dose containers, since it contains no preservative.
Bacteriostatic Water is sold by 39 research peptide vendors indexed on PeptideScouter, with 86 tracked listings compared per vendor in the table above. Pricing is normalized and refreshed daily.
All 39 indexed research peptide vendors currently have Bacteriostatic Water in stock. Stock state is refreshed daily from each vendor's catalog.
Discount codes are issued per vendor rather than per peptide, so any code applies across that vendor's whole catalog. 38 of the 39 vendors listing Bacteriostatic Water publish a PeptideScouter code, worth 5% to 25% off. These listings do not carry a comparable per-milligram price, so code availability is shown without a normalized effective price. Each vendor's code is shown beside its price in the table above.
39 research peptide vendors currently list Bacteriostatic Water on PeptideScouter. We track 86 listings across size and kit variants.
