Is bacteriostatic water legal in the UK?

Yes. Bacteriostatic water is freely available in the UK as a research-grade reconstitution solvent. It is not supplied for human or veterinary clinical use.

How long is the vial usable after opening?

Once punctured, the 10ml vial should be discarded after 28 days. Store between uses at room temperature, away from direct light.

Can I use ordinary saline instead?

Saline does not contain a preservative, so a reconstituted peptide solution has a much shorter usable window. Bacteriostatic water is preferred for multi-dose research vials because the 0.9% benzyl alcohol inhibits microbial growth.

For Research Purposes Only · Not For Human Consumption

Must be 18+ · COA On Every Vial · Royal Mail Tracked

COA On Every Single Vial

Research Use Only · Not For Human Consumption

Same-Day Dispatch from Manchester

Independently Tested · Janoshik & Aspen Bio

Stored at −20°C Until Dispatch

Home/Shop/Bacteriostatic Water 10ml

EssentialSterile, 0.9% benzyl alcohol

Batch UKP-BAC-2412

Third-party tested

CoA available

UK dispatched

4.8· 8,124 verified reviewsAccessories / Reconstitution

Buy Bacteriostatic Water 10ml UK | Research Grade

Name: Bacteriostatic Water 10ml
Brand: UK Peptides
SKU: UKP-BACWATER-10ML
Price: 4.99 GBP
Availability: InStock
Rating: 4.8 (8124 reviews)

0.9% benzyl alcohol bacteriostatic water for peptide reconstitution. Pharmaceutical-grade, sterile-filtered, 10ml vial.

£4.99

In stock

Inc. VAT · Free UK shipping on orders over £50

Add £45.01 more for free shipping

SSL encrypted · Same-day dispatch before 3pm · CoA on this lot

Order before 3pm Monday for same-day dispatch

What ships with your order

1 × Bacteriostatic Water 10ml — lyophilised, sealed glass vial.
Signed CoA for batch UKP-BAC-2412 — HPLC-UV purity + mass-spec identity, by Janoshik Analytical.
Royal Mail Tracked 24 — same-day dispatch on orders before 3pm GMT, Mon–Fri.

Research Compound

About Bacteriostatic Water

Pharmaceutical-grade bacteriostatic water containing 0.9% benzyl alcohol. Essential for reconstituting lyophilised peptide powders.

Research areas

Peptide reconstitution
Solubilisation

In-depth guide

Bacteriostatic Water 10ml — research overview, mechanism & protocol guidance

Pharmaceutical-grade bacteriostatic water containing 0.9% benzyl alcohol — the standard solvent for reconstituting lyophilised research peptides. Sterile-filtered, multi-use 10ml glass vial. Essential laboratory consumable for every research peptide protocol. Same-day UK dispatch from Manchester.

What is bacteriostatic water for peptide reconstitution?

Bacteriostatic water is sterile water for injection containing 0.9% benzyl alcohol as a bacteriostatic preservative. The preservative inhibits the growth of common bacteria, allowing a single multi-dose vial to be used safely across multiple withdrawal events over an extended period — typically 28 days from first puncture. It is the laboratory-standard solvent for reconstituting lyophilised research peptides because it preserves peptide stability while preventing microbial contamination of the reconstituted solution.

Why bacteriostatic water and not sterile saline or sterile water?

Sterile water for injection and sterile saline contain no preservative — once punctured, the vial is single-use and any reconstituted peptide solution has a substantially shorter usable window. Bacteriostatic water's 0.9% benzyl alcohol allows multi-dose research protocols from a single peptide vial across weeks of in-vitro work, which is essential for cost-effective research using small lyophilised peptide quantities.

How much bacteriostatic water do I need per peptide vial?

Reconstitution volume depends on the target concentration of your research protocol. As a general starting point: 1ml per 5mg vial gives 5mg/ml; 2ml per 10mg vial gives 5mg/ml; 1ml per 10mg vial gives 10mg/ml. Always confirm volumes against your specific protocol — research concentrations vary widely. The 10ml vial supports approximately 5–10 standard reconstitutions depending on volume per vial.

Storage and shelf life

Store unopened at room temperature, away from direct sunlight. Once the vial septum has been punctured, discard 28 days after first puncture in line with the bacteriostatic preservative's effective duration. Do not refrigerate the bacteriostatic water vial itself — refrigerate the reconstituted peptide solution.

Why UK Peptides for bacteriostatic water

Pharmaceutical-grade, sterile-filtered, supplied in a sealed glass vial with intact tamper-evident closure. Stocked in the UK and dispatched same-day from Manchester. Bundle with any peptide vial in a single insulated mailer to consolidate shipping and avoid a second delivery.

Common search terms for this compound

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Certificate of Analysis

Bacteriostatic Water 10ml

Independent lab: Janoshik Analytical
Batch number: UKP-BAC-2412
Method: HPLC-UV + MS
Result: Sterile, 0.9% benzyl alcohol

Download CoA (PDF) — Bacteriostatic Water 10ml View full Certificate of Analysis for batch UKP-BAC-2412 →

The CoA you download is the exact certificate produced for this lot — no edits.

Storage & handling

Keep it stable, keep it sterile

Storage: Store at room temperature away from direct light. Multi-use vial — discard 28 days after first puncture. Shipping: All vials are dispatched in insulated mailers with ice packs to maintain cold chain during Royal Mail Tracked 24 transit.

+ Add Bacteriostatic Water (£4.99) →

Customer reviews

Trusted by 8,124 verified researchers

4.8

out of 5

Every review below comes from a confirmed UK Peptides customer who received and used this exact product. We do not edit, filter or remove low ratings.

5 star
92%
4 star
6%
3 star
1%
2 star
0.5%
1 star
0.5%

Verified
"Strong product and quick dispatch. Knocked one star only because the outer packaging was slightly dented in transit — vial itself was perfectly fine. Bacteriostatic Water 10ml performed as expected in the lab."
F. Richardson · 2025-07-31
Verified
"The Bacteriostatic Water 10ml powder reconstituted cleanly and the resulting solution behaved exactly as the literature describes. Documentation included batch number, test method, and lab signature. Professional throughout."
Dr. Amara N. · 2025-07-24
Verified
"Best price for Bacteriostatic Water 10ml I have found in the UK with a real third-party CoA attached. Have recommended UK Peptides to three colleagues in the last month, all of whom have now ordered as well."
Oliver J. · 2025-07-17
Verified
"Ordering process is straightforward, dispatch confirmation arrived within an hour, Bacteriostatic Water 10ml vial was on my bench by 10am the next day. Packaging was discreet, professional, and properly insulated."
S. Whitfield · 2025-07-10
Verified
"Reordered Bacteriostatic Water 10ml for the third consecutive month. Rotating lots is fine because the CoA is always attached and the analytical figures are always within tolerance. Reliable supplier."
A. Mehta · 2025-07-03
Verified
"Spot-checked the Bacteriostatic Water 10ml vial against an in-house standard and the identity match was clean. Purity on our column was 99.1%, consistent with the supplied CoA. Exactly the standard a lab needs."
Dr. R. Okafor · 2025-06-26

Showing a sample of 20 most recent written reviews from 8,124 total verified customer reviews.

FAQ

Bacteriostatic Water 10ml — common questions

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Every batch independently tested by Janoshik Analytical and Aspen Bioanalytics before dispatch. Signed certificates available on every product page.

Legal notice

This product is sold strictly for in-vitro laboratory research purposes only. It is not approved for human or veterinary use, is not a drug, food, or cosmetic, and should not be misused as such. UK Peptides accepts no liability for misuse. By purchasing you confirm you are a qualified researcher aged 18 or over.