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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
Independently third-party tested and matched to the lot ID printed on your vial. Values below are from the latest released lot.
USP
Sterile grade
Passed full QC panel
independent third-party lab (Freedom Diagnostics Testing) accredited lab
Sterile water + 0.9% benzyl alcohol · multi-dose diluent
Lot details
ProductBacteriostatic Water
CompositionWater for injection + 0.9% benzyl alcohol
Volumes3 mL · 10 mL
GradeUSP / sterile
UseMulti-dose peptide reconstitution
Full QC panel · ISO 170255 assays
SterilityNo Growth ✓
Endotoxin (USP <85>)Within limits ✓
Benzyl alcohol0.9% ✓
pH4.5–7.0 ✓
AppearanceClear, colorless ✓
Bacteriostatic water is released against sterility and endotoxin testing by an independent ISO/IEC 17025-accredited laboratory. The benzyl alcohol preservative (0.9%) supports multi-dose use within recommended in-house windows after the first puncture. The lot-specific certificate is published in our public COA library and matched to the lot ID printed on the vial.
Product information
Composition & handling reference data — specifications, composition and storage.
Product Specifications
ProductBacteriostatic Water for Injection
Volumes3 mL & 10 mL
GradeUSP / sterile
PreservativeBenzyl alcohol (0.9%)
FormClear, colorless solution
pH4.5–7.0
Sterile-filledUnited States
Quality testingIndependent independent third-party laboratory release
Composition
BaseSterile Water for Injection
PreservativeBenzyl alcohol (0.9%)
FunctionBacteriostatic multi-dose diluent
CompatibilityLyophilized research peptides
pH range4.5–7.0
UseLyophilized-peptide reconstitution
Storage & Handling
AppearanceClear, colorless solution
CompositionSterile water + 0.9% benzyl alcohol
StorageRoom temperature · protect from light
In useRefrigerate after first puncture
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
FDA, anti-doping, and compounding status — provided for research context.
FDA StatusBacteriostatic Water for Injection USP is an FDA-regulated sterile product — a recognized USP article consisting of Water for Injection with 0.9% benzyl alcohol added as a bacteriostatic preservative. Koi supplies it for laboratory reconstitution use only — not for human or veterinary injection, and not as a finished drug product for any clinical purpose. It is intended for reconstituting research-grade compounds in an in vitro laboratory setting.
WADA Anti-Doping StatusNot applicable — bacteriostatic water is a sterile diluent, not a performance substance, and is not addressed by the WADA Prohibited List. Any compound it is used to reconstitute is governed by that compound’s own regulatory and anti-doping status.
Compounding Pharmacy StatusKoi Peptides is a chemical research supplier — not a compounding pharmacy or outsourcing facility under sections 503A or 503B of the Federal Food, Drug, and Cosmetic Act — and supplies no compounded preparations of any kind. Bacteriostatic water is provided as a laboratory diluent for research reconstitution, not as a compounded preparation.
Disclaimer
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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