Buy Bacteriostatic Water

Bacteriostatic Water – Sterile Peptide Reconstitution Solvent with Benzyl Alcohol | Peptides Lab UK

Bacteriostatic Water is sterile water for injection containing 0.9% benzyl alcohol as a preservative — the standard multi-use reconstitution solvent for lyophilised research peptides, supplied by Peptides Lab UK in a sterile, laboratory-grade format for in vitro and pre-clinical research use only.

Available to buy in the UK from Peptides Lab UK, bacteriostatic water is the most widely used reconstitution solvent in research peptide laboratories. The 0.9% benzyl alcohol content inhibits the growth of most bacteria, fungi, and other microorganisms in the reconstituted solution — making it the preferred choice for preparing multi-use peptide stock solutions that will be accessed repeatedly over days or weeks in laboratory settings. Each vial is supplied in a sterile, sealed format with a resealable rubber stopper to maintain sterility across multiple uses.

What is Bacteriostatic Water?

Bacteriostatic water is a preparation of sterile water for injection containing 0.9% w/v benzyl alcohol (C6H5CH2OH) as a bacteriostatic preservative. Benzyl alcohol is a widely used pharmaceutical and laboratory preservative that disrupts bacterial cell membrane integrity and inhibits bacterial enzyme systems — preventing microbial growth and maintaining the sterility of the reconstituted solution between uses. At the 0.9% concentration used in bacteriostatic water, benzyl alcohol provides effective antimicrobial protection without significantly affecting the physical or chemical stability of the peptide in solution.

The distinction between bacteriostatic water and other sterile diluents — such as sterile water for injection (SWFI) or normal saline — is its multi-use capability. Sterile water for injection is a single-use product: once the vial seal is broken, the absence of any preservative means that microbial contamination can occur with each subsequent access, making it unsuitable for the repeated needle access that is typical in peptide stock solution workflows. Bacteriostatic water, by contrast, is specifically designed for multi-dose use — the benzyl alcohol preservative maintains antimicrobial protection across repeated needle penetrations of the resealable stopper, making it the standard diluent for laboratory peptide stock solution preparation.

Bacteriostatic water is prepared at a neutral pH (typically 4.5–7.0, with most commercial preparations ranging between 5.0–6.5) and is isotonic-compatible for dilution into physiological buffers. It is compatible with the vast majority of research peptides that dissolve readily at neutral or mildly acidic pH — including most GLP-1 analogues, amylin analogues, and other water-soluble peptide preparations supplied by Peptides Lab UK.

Bacteriostatic Water – Key Research Facts

• Composition: Sterile water for injection + 0.9% w/v benzyl alcohol (bacteriostatic preservative)
• pH: Typically 4.5–7.0 (most preparations 5.0–6.5)
• Preservative mechanism: Benzyl alcohol disrupts bacterial cell membrane integrity and inhibits bacterial enzyme systems
• Primary advantage: Multi-use capability — maintains sterility across repeated needle access to the vial
• Shelf life after opening: Typically up to 28 days when stored correctly and accessed under sterile conditions
• Compatibility: Suitable for most water-soluble research peptides at neutral to mildly acidic pH
• Not suitable for: Peptides that require an acidic reconstitution environment — use acetic acid water first for those compounds
• Format: Sterile vial with resealable rubber stopper for multi-use access
• Distributed by: Peptides Lab UK

What is Bacteriostatic Water Used for in Peptide Research?

In the research laboratory, bacteriostatic water is the standard solvent for reconstituting lyophilised peptide preparations that are water-soluble at neutral pH. Its primary advantage over sterile water for injection is its multi-use capability — the benzyl alcohol preservative allows the same vial to be accessed multiple times with a sterile needle without compromising the sterility of the remaining solution, which is essential in research settings where a single stock solution vial may be used across multiple experiments or time points.

The standard reconstitution workflow for most research peptides using bacteriostatic water is straightforward: allow the lyophilised peptide vial to reach room temperature, add the appropriate volume of bacteriostatic water using a sterile needle and syringe, swirl gently (do not shake vigorously, as this can cause peptide aggregation or degradation), and allow to stand until fully dissolved. The resulting stock solution can then be stored at 2–8°C for subsequent use across multiple experimental sessions, with the benzyl alcohol content maintaining sterility throughout.

For peptides that do not dissolve cleanly in bacteriostatic water alone — typically those with hydrophobic sequences or basic amino acid-rich compositions that require protonation for solubilisation — the recommended approach is to first perform initial reconstitution in a small volume of 0.1% acetic acid water (also available from Peptides Lab UK) to produce a clear stock solution, before diluting further with bacteriostatic water or the relevant physiological buffer.

Bacteriostatic Water vs. Acetic Acid Water vs. Sterile Water — Which to Use?

Bacteriostatic Water is the first-choice reconstitution solvent for most water-soluble research peptides — particularly those intended for multi-use stock solutions. It is suitable for GLP-1 analogues, amylin analogues, most neuropeptides, and the majority of water-soluble peptide compounds supplied by Peptides Lab UK.

Acetic Acid Water (0.1%) is the recommended first-step solvent for lyophilised peptides that do not dissolve cleanly in neutral water — including many growth hormone-related peptides, IGF family peptides, GHRP-family peptides, and melanocortin analogues. After initial dissolution in acetic acid water, the stock solution is typically further diluted with bacteriostatic water or PBS.

Sterile Water for Injection (SWFI) is a single-use product with no preservative — suitable where only a single-use preparation is needed and multi-access storage is not required. It is not recommended for research peptide stock solutions that will be used across multiple experiments.

Which Peptides Are Typically Reconstituted with Bacteriostatic Water?

Bacteriostatic water is compatible with and recommended for the following categories of research peptides available from Peptides Lab UK:

• GLP-1 receptor agonists — Semaglutide, Tirzepatide, and related GLP-1 analogue preparations
• Amylin analogues — Cagrilintide and related amylin receptor agonist preparations
• Dual and triple peptide combinations — CagriSema, and other soluble multi-peptide blends
• BPC-157, TB-500, and most tissue repair peptide preparations
• Cerebrolysin and neuropeptide preparations with neutral-pH solubility
• VIP (Vasoactive Intestinal Peptide) and other hydrophilic neuropeptides
• Most peptides where the product datasheet specifies ‘sterile water’ or ‘bacteriostatic water’ as the reconstitution solvent

Bacteriostatic Water UK – Specifications

Product Details

• Composition: Sterile water for injection + 0.9% w/v benzyl alcohol
• Grade: Sterile, laboratory / research grade
• pH:5–7.0 (typically 5.0–6.5)
• Form: Sterile aqueous solution in sealed vial with resealable rubber stopper
• Multi-use: Yes — benzyl alcohol preservative maintains sterility across repeated needle access
• Storage: Store at room temperature (15–30°C); protect from freezing and direct sunlight
• Primary use: Reconstitution of lyophilised research peptides for in vitro and pre-clinical research
• Distributed by: Peptides Lab UK

Research Applications

Suitable Laboratory Uses for Bacteriostatic Water

• Multi-use stock solution preparation for lyophilised research peptides
• Reconstitution of GLP-1 analogues, amylin analogues, and dual-peptide research blends
• Reconstitution of BPC-157, TB-500, neuropeptides, and water-soluble peptide preparations
• Secondary dilution vehicle following initial acetic acid water reconstitution for hydrophobic peptides
• Vehicle control preparations in multi-session in vitro peptide assay protocols
• Preparation of peptide stock solutions for storage at 2–8°C across multiple experimental time points

Why Buy Bacteriostatic Water in the UK from Peptides Lab UK?

Peptides Lab UK supplies bacteriostatic water as a sterile, laboratory-grade reconstitution solvent specifically formatted for use with lyophilised research peptide preparations. Sourcing your reconstitution solvents from the same trusted UK peptides supplier as your research compounds ensures consistent, verified quality across every component of your experimental workflow.

Having bacteriostatic water and acetic acid water available from a single UK source simplifies procurement for research laboratories handling a range of peptide types — from water-soluble GLP-1 and amylin analogues that reconstitute directly in bacteriostatic water, to hydrophobic or basic peptides that require an acetic acid water first step before final dilution.

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Important Notice & Research Disclaimer

⚠️ This product is supplied by Peptides Lab UK strictly for laboratory research use only. Bacteriostatic water as distributed by Peptides Lab UK is not intended for, and must not be used for, human consumption, medical treatment, self-administration, veterinary applications, or any use outside of a controlled laboratory environment. This product is handled exclusively in controlled research settings for in vitro and pre-clinical studies, with no applications in human or veterinary medicine.

Handling must only be performed by qualified and trained laboratory professionals in accordance with applicable regulations and institutional guidelines. Peptides Lab UK accepts no liability for any use of this product outside of its intended laboratory research purpose.