Bacteriostatic Water Ireland | Buy Research-Grade Bacteriostatic Water | Sterile 0.9% Benzyl Alcohol

Bacteriostatic Water — sterile water for injection preserved with 0.9% benzyl alcohol — is the essential reconstitution and dilution solvent for research-grade lyophilised peptides, recombinant proteins, and biological research compounds available to laboratories in Ireland — a sterile, non-pyrogenic aqueous solution containing 0.9% w/v benzyl alcohol as a bacteriostatic preservative that inhibits microbial growth in reconstituted peptide solutions, enabling multiple-use vial access over extended periods while maintaining sterility between uses — making it an indispensable laboratory consumable for the reconstitution of lyophilised research peptides including growth hormone secretagogues, GHRH analogues, GLP-1 receptor agonists, incretin research compounds, recombinant proteins including HGH 191AA and EPO, GH-derived lipolytic fragments including HGH Fragment 176-191 and AOD9604, IGF-1 splice variant peptides including PEG MGF, sleep-regulatory peptides including DSIP, and all other lyophilised research compounds requiring aqueous reconstitution for in vitro and pre-clinical research applications. Researchers and institutions across Ireland can source verified, research-grade Bacteriostatic Water directly from our Irish supply, with domestic-speed dispatch and complete batch documentation.

✅ Sterile 0.9% Benzyl Alcohol Preserved

✅ Batch-Specific Certificate of Analysis (CoA) Included

✅ Non-Pyrogenic | Endotoxin Tested

✅ Fast Dispatch to Ireland | Peptides Ireland Stock

What Is Bacteriostatic Water?

Bacteriostatic Water — Water for Injection USP preserved with 0.9% w/v benzyl alcohol — is a sterile, non-pyrogenic aqueous solution specifically formulated for the reconstitution and multi-use dilution of lyophilised pharmaceutical and research compounds. The designation bacteriostatic refers to the benzyl alcohol preservative’s mechanism of action — benzyl alcohol at 0.9% w/v inhibits bacterial cell membrane integrity and disrupts metabolic function in a broad spectrum of Gram-positive and Gram-negative organisms, preventing microbial proliferation in reconstituted solutions without producing the bactericidal activity that would require higher antimicrobial concentrations. This bacteriostatic rather than bactericidal preservative action maintains solution sterility between multiple vial access events — the defining practical advantage of Bacteriostatic Water over unpreserved Sterile Water for Injection, which must be used immediately upon vial entry or discarded to prevent microbial contamination.

The pharmaceutical and research-grade specification of Bacteriostatic Water distinguishes it from laboratory-grade or analytical-grade water preparations — Bacteriostatic Water is manufactured to Water for Injection USP standards, requiring production by distillation or reverse osmosis from a suitable water source, testing for bacterial endotoxins below 0.25 EU/mL by the LAL method, sterility testing by membrane filtration to confirmed absence of microbial contamination, particulate matter testing below USP limits, pH within the 4.5–7.0 range, and osmolality confirmation consistent with a non-electrolyte aqueous solution. The 0.9% benzyl alcohol preservative concentration is the established pharmaceutical standard providing effective bacteriostasis across the relevant microbial challenge spectrum while remaining compatible with the chemical stability requirements of the peptide and protein research compounds reconstituted within it.

Benzyl alcohol’s preservative mechanism involves disruption of bacterial cell membrane lipid bilayer integrity — the aromatic alcohol partitions into bacterial membranes, increasing membrane fluidity and permeability, inhibiting electron transport chain function, and impairing membrane-dependent metabolic processes including nutrient transport and oxidative phosphorylation. This membrane-active mechanism provides broad-spectrum bacteriostatic coverage against Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and other environmental contaminants likely to be introduced through multiple vial access events. The 0.9% concentration is calibrated to provide effective bacteriostasis at the anticipated microbial challenge levels associated with multi-use vial access in laboratory research environments while remaining below the concentration ranges associated with peptide and protein stability perturbation in reconstituted research compound solutions.

What Is Bacteriostatic Water Used For in Research?

Bacteriostatic Water is the recommended reconstitution solvent for the majority of lyophilised peptide and recombinant protein research compounds used in laboratory settings — selected over unpreserved Sterile Water for Injection and standard buffer solutions when multi-use vial access, extended reconstituted peptide storage, or compatibility with benzyl alcohol-tolerant research compounds is required:

Lyophilised Peptide Reconstitution — Growth Hormone Secretagogues

Bacteriostatic Water is the standard reconstitution solvent for growth hormone secretagogue research peptides including GHRP-6, GHRP-2 Acetate, Ipamorelin, and Hexarelin — dissolving the lyophilised hexapeptide and pentapeptide powders to produce research-grade working solutions with maintained sterility across multiple withdrawal events. The benzyl alcohol preservative prevents microbial growth in GHS-R1a agonist reconstituted solutions stored between experimental uses — enabling the preparation of stock solutions from single vials that can be accessed repeatedly over days to weeks without sterility compromise when stored at the recommended 4°C or -20°C temperatures. For GH secretion studies requiring repeated dosing in in vivo rodent models, Bacteriostatic Water reconstitution of GH secretagogue peptides enables multi-day experimental protocols from a single reconstituted vial without the sterility risk associated with multiple entries into unpreserved aqueous solutions.

GHRH Analogue Reconstitution — Sermorelin, Modified GRF(1-29), Tesamorelin

Bacteriostatic Water provides the recommended multi-use reconstitution vehicle for GHRH analogue research compounds including Sermorelin Acetate, Modified GRF(1-29), and Tesamorelin — dissolving the lyophilised GHRH peptide powders while the benzyl alcohol preservative maintains solution sterility across the multiple vial access events typical of comparative GHRH analogue research protocols requiring repeated compound withdrawal for dose-response and time-course studies. The 0.9% benzyl alcohol concentration is compatible with the chemical stability requirements of GHRH analogue peptides — the acetate salt formulations of Sermorelin and Modified GRF(1-29) show good stability in Bacteriostatic Water at 4°C storage for periods consistent with typical research protocol durations. Note that for CJC-1295 With DAC, Bacteriostatic Water reconstitution is suitable for in vivo albumin-conjugation applications but must be confirmed free of thiol-containing impurities that could quench the reactive maleimide DAC linker.

Recombinant Protein Reconstitution — HGH 191AA and EPO

Bacteriostatic Water is used for recombinant protein reconstitution including HGH 191AA and EPO 4000IU where multi-use vial access is required — providing a preserved aqueous environment compatible with protein stability when supplemented with appropriate carrier protein. For HGH 191AA and EPO reconstitution with Bacteriostatic Water, BSA at 0.1% should be added to the reconstitution solution to prevent protein adsorption to vial and pipette surfaces and to stabilise the glycoprotein or polypeptide structure in solution between uses. The benzyl alcohol preservative in Bacteriostatic Water does not interact with the BSA carrier at 0.9% concentration — the combined Bacteriostatic Water plus 0.1% BSA reconstitution vehicle provides both bacteriostatic preservation and carrier protein stabilisation for multi-use recombinant protein research vials.

GH-Derived Lipolytic Fragment Reconstitution — HGH Fragment 176-191 and AOD9604

Bacteriostatic Water is compatible with HGH Fragment 176-191 and AOD9604 reconstitution — dissolving the lyophilised disulphide-containing lipolytic domain peptides while maintaining sterility across multiple access events in adipocyte biology and lipolysis research protocols. Critical compatibility requirement for these compounds: the Bacteriostatic Water used must be confirmed free of reducing agent contamination — the disulphide bridges in HGH Fragment 176-191 (Cys182-Cys189) and AOD9604 (Cys7-Cys14) are essential for full lipolytic potency and will be reduced by any thiol-containing contaminants. Research-grade Bacteriostatic Water manufactured to USP standards does not contain reducing agents — however, this should be verified for any Bacteriostatic Water source before use with disulphide-containing research compounds.

IGF-1 Splice Variant and Neuropeptide Reconstitution

Bacteriostatic Water provides a suitable multi-use reconstitution vehicle for PEG MGF — the PEGylation of the MGF E-domain peptide provides aqueous solubility compatible with direct Bacteriostatic Water reconstitution without the acetic acid acidification sometimes required for unconjugated peptides. For DSIP reconstitution in Bacteriostatic Water, the nonapeptide dissolves readily and the benzyl alcohol preservative is compatible with DSIP’s chemical stability requirements — however, light protection must be maintained throughout as DSIP’s Trp1 residue remains photosensitive in Bacteriostatic Water solution as in all reconstitution vehicles. For GLP-1 reconstitution in Bacteriostatic Water, the DPP-IV inhibitor requirement for biological matrix applications applies regardless of reconstitution vehicle — Bacteriostatic Water itself does not contain DPP-IV activity, but any subsequent addition to biological matrices requires DPP-IV inhibitor supplementation.

Multi-Use Vial Preparation and Extended Storage Research Protocols

The primary research utility of Bacteriostatic Water over unpreserved Sterile Water for Injection is the ability to prepare single reconstituted peptide vials for multi-use access across extended experimental protocols — withdrawing multiple aliquots over days to weeks without sterility compromise. This multi-use capability is particularly valuable in in vivo rodent research requiring daily or twice-daily peptide administration across multi-week study durations, in dose-response studies requiring multiple concentration preparation from a single reconstituted stock, and in comparative pharmacology protocols requiring repeated access to multiple reconstituted compound vials simultaneously. The 28-day multi-use window typically cited for Bacteriostatic Water-reconstituted compounds — reflecting the bacteriostatic preservation duration under recommended storage and handling conditions — covers the majority of standard pre-clinical research protocol durations.

Bacteriostatic Water Versus Alternative Reconstitution Solvents

Parameter	Bacteriostatic Water	Sterile Water for Injection	0.9% Sodium Chloride (Normal Saline)	0.1% Acetic Acid Solution	PBS pH 7.4
Preservative	0.9% benzyl alcohol — bacteriostatic	None	None	None	None
Multi-Use Vial Suitability	Yes — primary advantage	No — single use only	No — single use only	No — single use only	No — single use only
pH	4.5–7.0	5.0–7.0	4.5–7.0	~3.0–4.0	~7.4
Tonicity	Hypotonic	Hypotonic	Isotonic	Hypotonic	Isotonic
Peptide Compatibility	Broad — most lyophilised peptides	Broad	Most peptides — ionic strength consideration	Acidic-solubility peptides	Protein and neutral pH peptides
Protein Compatibility	Yes — with BSA carrier	Yes — with BSA carrier	Partial — ionic strength	Not recommended	Yes — preferred for proteins
Disulphide Compatibility	Yes — no reducing agents	Yes	Yes	Yes	Yes
DPP-IV Activity	None	None	None	None	None
In Vivo Administration	Compatible — benzyl alcohol limits apply	Compatible — single use	Compatible — isotonic preferred	Not recommended — acidic	Compatible — isotonic
Key Advantage	Multi-use preserved reconstitution — 28-day window	Simplest vehicle — no additives	Isotonic — in vivo compatible	Acidic pH solubilisation for hydrophobic peptides	Physiological pH — protein stability
Key Limitation	Benzyl alcohol contraindicated for neonatal and some sensitive assay applications	Single use only — sterility risk on re-entry	No preservation — single use	Acidic pH — protein instability	No preservation — single use

Product Specifications

Parameter	Detail
Name	Bacteriostatic Water
Also Designated	Bacteriostatic Water for Injection / BWFI / Preserved Sterile Water / 0.9% Benzyl Alcohol Water
Type	Sterile Preserved Aqueous Solution — Research and Pharmaceutical Grade Reconstitution Solvent
Composition	Water for Injection USP + 0.9% w/v Benzyl Alcohol (preservative)
Benzyl Alcohol Concentration	0.9% w/v — bacteriostatic concentration — broad-spectrum microbial growth inhibition
pH	4.5–7.0
Osmolality	Hypotonic — approximately 9 mOsm/kg
Endotoxin	≤0.25 EU/mL — LAL method tested
Sterility	Sterile — membrane filtration tested to USP requirements
Particulate Matter	Compliant with USP particulate matter limits for injections
Appearance	Clear, colourless solution — free of visible particulates
Container	Sterile sealed vial — rubber septum for needle access
Multi-Use Window	Up to 28 days from first vial entry under recommended storage and handling
Storage	Room temperature — 15–30°C — protect from freezing and direct light
Key Advantage	Benzyl alcohol bacteriostatic preservation enabling multi-use vial access — essential for extended in vivo research protocols and multi-access in vitro applications
Intended Use	Reconstitution and dilution of lyophilised research compounds — research use

Bacteriostatic Water Handling — Important Notes

Bacteriostatic Water requires standard aseptic technique throughout all vial access events to maintain the integrity of the bacteriostatic preservation system. Swab the rubber septum with 70% isopropyl alcohol before each needle entry and allow to dry before insertion. Use a new sterile needle for each vial access — do not reuse needles between access events as needle contamination bypasses the benzyl alcohol preservative at the vial entry point. Store the vial at room temperature between uses — 15–30°C — unless the reconstituted peptide’s stability requirements mandate refrigerated or frozen storage, in which case follow the reconstituted compound’s specific storage temperature guidance. Do not freeze Bacteriostatic Water itself as freezing can crack the vial seal and compromise sterility. Record the date of first vial entry and discard after 28 days regardless of remaining volume — the bacteriostatic preservation system provides a defined multi-use window, not indefinite sterility maintenance.

For reconstitution of lyophilised peptide research compounds with Bacteriostatic Water, add the Bacteriostatic Water to the lyophilised powder vial rather than adding powder to water — this ensures complete powder wetting and dissolution without generating undissolved aggregates. Add the reconstitution volume slowly along the vial wall rather than directing the stream onto the lyophilised cake, swirl gently until fully dissolved, and do not vortex as mechanical agitation can cause peptide and protein aggregation. For compounds requiring acetic acid acidification for solubility — including some hydrophobic peptides — Bacteriostatic Water may need to be acidified with sterile acetic acid to achieve the required pH for dissolution before addition to the lyophilised compound. For compounds requiring BSA carrier protein — including HGH 191AA, EPO, and GLP-1 — add BSA to the Bacteriostatic Water reconstitution volume before addition to the lyophilised compound to ensure the carrier protein is present from the point of dissolution.

Benzyl alcohol compatibility considerations apply for specific research applications — benzyl alcohol at 0.9% has been associated with toxicity in neonatal models and premature animal subjects, and for research applications involving neonatal or embryonic cell cultures or very early developmental biology models, unpreserved Sterile Water for Injection or PBS may be the preferred reconstitution vehicle. For in vitro cytotoxicity assays where benzyl alcohol vehicle effects could confound results, include matched Bacteriostatic Water vehicle controls at the same final benzyl alcohol concentration as the peptide treatment to distinguish compound-specific from vehicle-associated biological effects.

Buy Bacteriostatic Water in Ireland — What’s Included

Every order of Bacteriostatic Water in Ireland includes:

✅ Batch-Specific Certificate of Analysis (CoA)

✅ Endotoxin Test Report — LAL method ≤0.25 EU/mL

✅ Sterility Test Report

✅ Benzyl Alcohol Concentration Verification — 0.9% w/v confirmed

✅ Particulate Matter Compliance Report

✅ pH Confirmation

Frequently Asked Questions — Bacteriostatic Water Ireland

Can I Buy Bacteriostatic Water in Ireland?

Yes — research-grade Bacteriostatic Water is available to researchers and institutions across Ireland with fast dispatch and full batch documentation.

What Is the Difference Between Bacteriostatic Water and Sterile Water for Injection?

Bacteriostatic Water contains 0.9% benzyl alcohol preservative enabling multi-use vial access over up to 28 days — Sterile Water for Injection contains no preservative and must be used immediately upon vial entry or discarded. For research protocols requiring repeated access to reconstituted peptide solutions, Bacteriostatic Water is the appropriate choice; for single-use reconstitution or applications where benzyl alcohol is contraindicated, Sterile Water for Injection is preferred.

How Long Can Reconstituted Peptides Be Stored in Bacteriostatic Water?

The benzyl alcohol preservative maintains bacteriostatic protection for up to 28 days from first vial entry under recommended storage conditions — however, the reconstituted peptide’s own chemical stability is the determining factor for effective use window. Most lyophilised research peptides reconstituted in Bacteriostatic Water should be aliquoted and stored at -20°C or -80°C per the individual compound’s storage guidance, with the 28-day bacteriostatic window representing a maximum rather than a recommended ambient storage duration.

Is Bacteriostatic Water Compatible With All Research Peptides?

Bacteriostatic Water is compatible with the majority of research peptides including GH secretagogues, GHRH analogues, lipolytic fragments, incretin peptides, and neuropeptides. Specific compatibility considerations include confirmation of absence of reducing agents for disulphide-containing peptides, BSA carrier supplementation for recombinant proteins, and acetic acid acidification for hydrophobic peptides requiring low pH solubilisation. For CJC-1295 With DAC, confirm thiol-free status before use to protect the reactive maleimide DAC linker.

What Is Benzyl Alcohol and Why Is It Used as a Preservative?

Benzyl alcohol is an aromatic alcohol that disrupts bacterial cell membrane integrity and inhibits membrane-dependent metabolic processes at 0.9% w/v concentration — providing broad-spectrum bacteriostatic activity against Gram-positive and Gram-negative contaminants without producing the higher-concentration cytotoxicity associated with bactericidal antimicrobial preservatives. The 0.9% concentration is the established pharmaceutical standard balancing antimicrobial efficacy with compatibility across the range of pharmaceutical and research compounds reconstituted in Bacteriostatic Water.

Should Vehicle Controls Be Used When Working With Bacteriostatic Water?

Yes — for any in vitro biological assay where the reconstituted peptide is added to cell cultures or tissue preparations, matched Bacteriostatic Water vehicle controls at the same final benzyl alcohol concentration as the highest peptide treatment concentration should be included to confirm absence of benzyl alcohol-mediated biological effects on the assay endpoints measured. The final benzyl alcohol concentration after dilution into assay media is typically well below the range associated with cellular effects, but vehicle controls remain essential for rigorous experimental design.

What Purity and Quality Standards Apply to Research-Grade Bacteriostatic Water?

Research-grade Bacteriostatic Water is manufactured to Water for Injection USP standards with endotoxin testing by the LAL method to ≤0.25 EU/mL, sterility testing by membrane filtration, particulate matter testing to USP limits, benzyl alcohol concentration verification at 0.9% w/v, and pH confirmation within 4.5–7.0. These quality specifications ensure the reconstitution solvent does not introduce endotoxin, microbial, particulate, or chemical contamination into reconstituted research compound solutions.

Research Disclaimer

Bacteriostatic Water is supplied for use as a reconstitution and dilution solvent in legitimate scientific research conducted within licensed laboratory environments. This product is not intended for human administration or therapeutic application outside of appropriately licensed and regulated contexts. It must be handled using standard aseptic technique by qualified researchers in compliance with applicable Irish and EU laboratory safety regulations and institutional guidelines. By purchasing, you confirm that this product will be used solely for approved laboratory research purposes.