Bacteriostatic Water
Sterile water with 0.9% benzyl alcohol — standard for peptide reconstitution
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Lot-specific COA
HPLC >99% — Janoshik analysis on request
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About Bacteriostatic Water
Updated June 2026In stock now. Bacteriostatic Water 10 mL from $8, >99% HPLC-verified purity, ships in 4 to 7 days with a lot-specific COA on request. For research use only.
Bacteriostatic water is sterile water with 0.9% benzyl alcohol, the standard diluent for reconstituting lyophilized research peptides. Supplied in a sealed 10 mL vial; it supports multi-dose withdrawal for up to 28 days after first puncture. For research use only.
Bacteriostatic Water (Aqua bacteriostatica) is sterile water for injection containing 0.9% benzyl alcohol as a bacteriostatic preservative. This formulation is the standard solvent for reconstitution of lyophilized peptides in research. Benzyl alcohol inhibits microbial growth and enables multiple withdrawals from the vial over a period of up to 28 days after first puncture. The product is supplied in sterile 10-mL glass vials with rubber stopper and aluminum crimp cap.
Specifications
- Sterile water with 0.9% benzyl alcohol as bacteriostatic preservative
- Enables multi-dose withdrawal for up to 28 days after first puncture
- Standard solvent for reconstitution of lyophilized peptides
- Sterile 10-mL glass vials with rubber stopper and crimp cap
- Bacteriostatic action via inhibition of microbial proliferation
Research context
Bacteriostatic water is described as a category in the United States Pharmacopeia monograph for sterile water containing an antimicrobial preservative. The use of benzyl alcohol as a preservative is documented in the FDA Guidance "Inactive Ingredient Database". Stability data for reconstituted peptides in bacteriostatic water are published in the Journal of Pharmaceutical Sciences.
Storage & handling
Temperature
15–25°C (room temperature)
Conditions
Protect from direct light, refrigerate after opening
Shelf life
24 months (unopened) / 28 days (after opening)
Frequently asked questions
What is bacteriostatic water used for?
Bacteriostatic water (sterile water with 0.9% benzyl alcohol) is the standard diluent for reconstituting lyophilized research peptides. The benzyl alcohol inhibits microbial growth, so the same vial can be punctured multiple times for up to 28 days after first use.
How is bacteriostatic water different from sterile water?
Plain sterile water for injection has no preservative and is intended for single use. Bacteriostatic water adds 0.9% benzyl alcohol as a bacteriostatic agent, which is why it supports multi-dose withdrawal over several weeks once opened.
How much bacteriostatic water do I need per peptide vial?
It depends on the target concentration. As a common example, adding 2 mL of bacteriostatic water to a 10 mg peptide vial yields 5 mg/mL. Always add the water slowly down the inner wall of the vial and swirl gently rather than shaking.
How is bacteriostatic water stored?
Store unopened vials at room temperature (15 to 25C) away from direct light. After first puncture, refrigerate and use within 28 days. Shelf life is 24 months unopened.
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Research reference
Read the Bacteriostatic Water research guide
Dosage math, reconstitution, COA checks and protocol context for Bacteriostatic Water.
