How long does bacteriostatic water last after opening?

When stored properly (refrigerated, 2–8°C), bacteriostatic water can typically be drawn from for approximately 28 days after the vial seal is broken. The 0.9% benzyl alcohol preservative is what allows for this multi-draw window.

How is bacteriostatic water different from sterile water?

Sterile water for injection contains no preservatives and must be used immediately after opening. Bacteriostatic water contains 0.9% benzyl alcohol, which inhibits bacterial growth and allows the vial to be used over multiple draws.

How should bacteriostatic water be stored?

Unopened vials are stable at room temperature. Once opened, vials should be refrigerated (2–8°C) and used within approximately 28 days. Always inspect the solution before each use; cloudiness or visible particulates indicate the vial should be discarded.

Why is bacteriostatic water needed?

All NextSelf Labs research peptides are supplied as lyophilized (freeze-dried) powders. Bacteriostatic water is the diluent used to bring those powders back into solution for research use — making it a foundational supply for any peptide research workflow.

Is bacteriostatic water FDA-approved?

Bacteriostatic water for injection is FDA-approved as a pharmaceutical excipient. NextSelf Labs supplies it strictly as a research-use diluent, in keeping with the research-only positioning of the catalog.

Do I need a prescription to purchase BAC Water?

No. NextSelf Labs sells BAC Water as a research supply for laboratory use only.

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BAC Water

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Sterile bacteriostatic water for research peptide reconstitution. The standard diluent across virtually all peptide research protocols.

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3mL
10mL

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For RESEARCH USE ONLY (RUO).

About the Peptide

The supply that makes everything else work.

Bacteriostatic water is sterile water containing 0.9% benzyl alcohol, a preservative that inhibits the growth of bacteria once the vial has been opened. It is the standard diluent used across virtually all peptide research protocols for reconstituting lyophilized peptides.

Unlike standard sterile water, which must be discarded immediately after the seal is broken, bacteriostatic water can be drawn from over the course of approximately 28 days when refrigerated — making it the practical choice for research workflows that require multiple draws from the same vial.

Every peptide in the NextSelf Labs catalog is supplied as a lyophilized (freeze-dried) powder. Bacteriostatic water is what brings those powders back into solution for research use, making it foundational supply for any peptide research workflow.

Research Applications

Why every research workflow starts here.

Bacteriostatic water is rarely the most exciting part of a research protocol — but it’s the part everything else depends on. NextSelf Labs supplies it to the same standards as the peptides it reconstitutes.

Multi-Draw Workflows

The 0.9% benzyl alcohol preservative inhibits bacterial growth between draws, allowing a single vial to be used over the course of approximately 28 days when refrigerated — the standard for research workflows.

Universal Compatibility

Bacteriostatic water is the standard diluent across virtually all peptide research protocols, compatible with the lyophilized peptides in the NextSelf Labs catalog and the broader peptide research literature.

Sterility & Quality

NextSelf Labs supplies bacteriostatic water to the same sterility and quality standards expected in any research environment, ensuring the diluent does not introduce contamination into peptide solutions.

Certificate of Analysis

Independently Tested. Verified by Batch.

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Purity

Tested Purity by HPLC

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Content

Labeled amount per vial

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Net Content

Actual amount per vial

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Identification

Mass spectrometry confirmed

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Frequently Asked

BAC Water

The supply that makes everything else work.

Why every research workflow starts here.

Multi-Draw Workflows

Universal Compatibility

Sterility & Quality

Independently Tested. Verified by Batch.

Questions.

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