Description
Research Supply — Reconstitution Solvent
Bacteriostatic Water — Research & Data
USP-grade bacteriostatic water containing 0.9% benzyl alcohol as a bacteriostatic preservative. It is the standard solvent for reconstituting lyophilized peptides for research use. The benzyl alcohol preservative inhibits microbial growth, allowing multiple withdrawals from a single vial over up to 28 days.
How Bacteriostatic Water Works
Bacteriostatic water serves as the reconstitution vehicle for lyophilized peptide powders. When added to a vial of lyophilized peptide, the water dissolves the peptide into a solution suitable for research use. The 0.9% benzyl alcohol preservative prevents bacterial growth during storage and repeated needle punctures, maintaining sterility for up to 28 days. The neutral pH minimizes peptide degradation through hydrolysis.
Mechanisms of Action
Bacteriostatic Action
Benzyl alcohol at 0.9% concentration disrupts microbial cell membranes and inhibits bacterial growth, preventing contamination during multiple-use applications.
Peptide Compatibility
The aqueous vehicle with minimal additives maintains peptide stability and bioactivity during reconstitution. pH is neutral (5.7-7.0) to minimize hydrolysis.
vs Sterile Water
Unlike single-use sterile water, bacteriostatic water permits multiple punctures over 28 days due to the preservative. Sterile water must be discarded after a single use.
What Research Has Shown
Bacteriostatic water is a well-established pharmaceutical vehicle with decades of clinical use. USP standards ensure consistent quality, sterility, and preservative efficacy. The 0.9% benzyl alcohol concentration has been validated to maintain bacteriostatic activity for at least 28 days after first puncture when stored under refrigeration.
Dosing Information from Research
Typical reconstitution: Add 1-2 ml of bacteriostatic water per vial of lyophilized peptide. Direct the stream along the glass wall of the vial — do not inject directly onto the powder. Gently swirl (do not shake) until fully dissolved. The reconstitution volume determines the concentration per unit volume.
Pharmacokinetics
Not applicable — bacteriostatic water is a vehicle, not an active compound. Benzyl alcohol is metabolized to benzoic acid and excreted as hippuric acid. At the 0.9% concentration used, systemic benzyl alcohol exposure from peptide reconstitution is negligible.
How It Works in the Body
Bacteriostatic water does not have a pharmacological mechanism of action. It serves exclusively as a reconstitution solvent. The benzyl alcohol preservative functions by disrupting bacterial cell membranes at the 0.9% concentration, preventing contamination. Water provides the aqueous medium for dissolving lyophilized peptide powder into a usable research solution.
Important Notes
- Bacteriostatic water is NOT the same as sterile water — sterile water lacks preservative and must be discarded after single use.
- Do NOT use for neonatal preparations — benzyl alcohol is contraindicated in neonates.
- Store at room temperature before opening; refrigerate after first puncture.
- Discard 28 days after first puncture regardless of remaining volume.
- Some peptides (e.g., NAD+) require sterile water instead — check peptide-specific instructions.
Safety Profile from Research
What clinical studies report
Bacteriostatic water with 0.9% benzyl alcohol is generally recognized as safe for research use. It has been used in pharmaceutical preparations for decades with an established safety profile.
⚠️ Theoretical Concern — Benzyl Alcohol Sensitivity
Rare allergic reactions to benzyl alcohol have been reported. Benzyl alcohol is contraindicated in neonates due to the risk of ‘gasping syndrome.’ At 0.9% concentration in small reconstitution volumes, systemic exposure is minimal.
Researcher Notes
- Always use bacteriostatic water (not sterile water) for peptides that will be used over multiple days.
- Reconstitute gently — direct stream along vial wall, swirl, do not shake.
- Label vials with the date of first puncture and discard after 28 days.
- Store reconstituted peptides at 2-8°C to maintain stability.
- Check individual peptide compatibility — some compounds require sterile water only.
Compound Information
Storage Requirements
Lyophilized
Store at controlled room temperature (20-25°C) before opening.
Reconstituted
Refrigerate at 2-8°C after first puncture. Use within 28 days.
Light Sensitivity
Not significantly light-sensitive. Store in original container.
Research Status — Where It Stands
Bacteriostatic water is a USP-grade pharmaceutical vehicle with established regulatory status. It is widely used in clinical, research, and pharmacy compounding settings. No investigational status — it is a standard pharmaceutical supply.
Harry Brown –
Best product I used.