Bacteriostatic Water for Peptide Reconstitution – 3 mL & 10 mL (10ml Vial)
$15.00
Sterile bacteriostatic water (water for injection with 0.9% benzyl alcohol), supplied in 3 mL and 10 mL vials for the reconstitution of lyophilized research peptides.
In stock
Tested by Freedom Diagnostics TestingHPLC purity + LC-MS identityLot-matched COA on-site
For research use only. This product is a laboratory research chemical. It is not for human or veterinary use, not a drug, supplement, or food, and not intended to diagnose, treat, cure, or prevent any disease. Sold only to qualified researchers and institutions.
What is Bacteriostatic Water?
Bacteriostatic Water is sterile Water for Injection containing 0.9% benzyl alcohol, a bacteriostatic preservative. It is the standard diluent laboratories use to reconstitute lyophilized research peptides, and the benzyl alcohol inhibits bacterial growth so a reconstituted vial can support multi-dose use within recommended in-house windows after the first puncture.
Unlike plain sterile water, which has no preservative and is best for single-use reconstitution, bacteriostatic water’s preservative supports repeated withdrawals from the same vial. Its near-neutral pH (4.5–7.0) is compatible with the majority of research peptides, though it is not suitable for peptides known to be incompatible with benzyl alcohol — plain sterile water should be used for those. Koi supplies bacteriostatic water for laboratory reconstitution use only.
Every lot, independently verified
Product information
Composition & handling reference data — specifications, composition and storage.
How Bacteriostatic Water Is Used
- Provides a sterile, preserved aqueous diluent for reconstituting lyophilized research peptides.
- The 0.9% benzyl alcohol acts as a bacteriostatic preservative, inhibiting bacterial growth to support multi-dose use.
- Neutral-to-slightly-acidic pH (4.5–7.0) is compatible with the majority of research peptides.
- Add the diluent slowly down the vial wall onto the lyophilized cake to limit foaming, and avoid vortexing.
- Not suitable for peptides that are incompatible with benzyl alcohol — use plain sterile water for those.
- Supports aseptic, repeatable reconstitution across an experimental series.
Why Bacteriostatic vs Sterile Water
- Plain sterile water has no preservative and is best for single-use reconstitution; bacteriostatic water supports multi-dose use over a longer window.
- The 0.9% benzyl alcohol inhibits bacterial growth between withdrawals, supporting repeatable peptide dilution across a series.
- Multi-dose reconstitution of lyophilized research peptides for cell-culture and biochemical assays.
- Preparation of working stock solutions where a preserved diluent supports aseptic handling workflows.
- Storage of reconstituted peptide stocks within preservative-supported in-house windows.
- General laboratory reconstitution where benzyl alcohol compatibility is acceptable.
Why Buy Bacteriostatic Water from Koi Peptides?
- Every lot of Koi bacteriostatic water is sterile-filled in the United States and released against independent third-party laboratory (Freedom Diagnostics Testing) testing.
- Each lot is released against sterility and endotoxin testing, with the 0.9% benzyl alcohol content and pH confirmed.
- The lot ID is printed on every vial and ties back to a public COA library, so researchers can verify documentation before they buy and after the vial arrives.
- Orders placed before 2 PM CT ship the same business day, and shipping is free on orders over $200.
- United States Pharmacopeia. Bacteriostatic Water for Injection, USP monograph.
- Koi Peptides. Reconstitution of lyophilized peptides — laboratory handling guide.
- United States Pharmacopeia. Benzyl alcohol as a bacteriostatic preservative in multi-dose parenteral diluents — pharmacopeial guidance.
Regulatory Status
For research use only. Not for human or veterinary use. Bacteriostatic Water is supplied to qualified research professionals for in vitro laboratory study. It is not intended to diagnose, treat, cure, or prevent any disease. By purchasing, the buyer agrees this material will not be introduced into humans or animals. Misuse may violate federal, state, or local laws.
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