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Premium research peptides at >99% HPLC-verified purity, third-party tested by Janoshik Analytical with a Certificate of Analysis on every lot. Shipped lab-direct, discreet and cold-chain, worldwide. For laboratory research use only.
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Research use only (RUO). All products are sold strictly for laboratory and research purposes — not for human or veterinary consumption. Purchasers must be 21 or older.
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© 2026 New-U Research Compounds · new-u.io · @new.u.io
Bacteriostatic Water
What It's Researched For
Peptide Reconstitution
Dissolves lyophilised peptide powders into injectable or usable solutions - the essential first step of every research protocol.
Multi-Dose Safe
0.9% benzyl alcohol preservative inhibits bacterial growth for 28 days after first use when refrigerated.
USP Grade
Manufactured and sterilised to USP pharmaceutical compendial standards.
Tamper-Evident
Sealed vials with tamper-evident closures for sterility assurance.
Universal Compatibility
Compatible with essentially all research peptides as the standard reconstitution solvent.
Precise Dilution
Use 1-2 mL per peptide vial to achieve desired working concentration.
Overview
Bacteriostatic water is USP-grade sterile water containing 0.9% benzyl alcohol as a preservative - the standard solvent used to reconstitute lyophilised research peptides into injectable solutions.
Almost every peptide on this site is supplied as a lyophilised (freeze-dried) powder. Lyophilisation removes water from the peptide while preserving its structure, which dramatically extends shelf life - but before the peptide can actually be injected or used in a research protocol, you need to reconstitute it. Bacteriostatic water is the standard solvent for that job.
The "bacteriostatic" part refers to the 0.9% benzyl alcohol added as a preservative. Benzyl alcohol does not kill bacteria outright (which would make the water bactericidal), but it inhibits their growth strongly enough that a multi-dose vial stays sterile for up to 28 days at 2-8 °C once opened. That is the practical advantage over plain sterile water, which would need to be used immediately after opening.
Bacteriostatic water is the minimum required accessory for any peptide research protocol. New-U Research Compounds supplies it as USP-grade, tamper-evident vials for reconstituting lyophilised research peptides.
Mechanism of Action
Bacteriostatic water is sterile water for injection with 0.9% benzyl alcohol - a preservative that inhibits bacterial growth without killing the bacteria outright.
Bacteriostatic water for injection is a USP compendial article defined as sterile water containing 0.9% w/v benzyl alcohol. The preservative concentration is deliberately chosen to inhibit microbial growth in multi-dose vials without exceeding the safe benzyl alcohol exposure threshold for typical dosing volumes. Note that benzyl alcohol is contraindicated for neonates and is not recommended for dilution in very large volumes, which is a standard clinical caution carried over into research handling.
Common Questions People Are Asking
What is the difference between bacteriostatic water and sterile water?
Both are sterile at the point of manufacture, but bacteriostatic water contains 0.9% benzyl alcohol as a preservative that inhibits bacterial growth after the vial is opened. Plain sterile water for injection is single-use: once you puncture the seal, it should be used immediately. Bacteriostatic water can safely be drawn from multiple times over 28 days if refrigerated.
How much bacteriostatic water should I use to reconstitute a peptide vial?
Typically 1-2 mL per vial, but the exact volume depends on the desired final concentration and how the peptide will be dosed. For example, reconstituting a 10 mg vial in 2 mL gives 5 mg/mL, so 0.1 mL = 0.5 mg. Always calculate in advance based on the protocol you are following.
Why should I inject the water slowly against the vial wall?
To avoid a direct stream of water hitting the lyophilised peptide cake. A harsh stream can shear the peptide and risk denaturation, and it also creates foam which traps peptide. Slow injection against the glass wall lets the water dissolve the cake gently - swirl afterwards rather than shaking.
Can I freeze bacteriostatic water?
No - freezing is not recommended. The benzyl alcohol preservative can separate from the water on freeze-thaw, and the product is designed to be stored at room temperature when sealed or at 2-8 °C once opened. Do not freeze, and do not use if the solution appears cloudy or particulate.
Do I need a prescription to buy bacteriostatic water?
No. New-U Research Compounds supplies bacteriostatic water as a research reconstitution solvent, sold strictly for laboratory research use - no prescription is required. Pharmacy-grade bacteriostatic water is typically gated behind a prescription and large retailers restrict it, which is exactly why researchers find it hard to source. We keep USP-grade, sealed tamper-evident vials in stock. Not for human use.
Why is bacteriostatic water so hard to find or out of stock?
It is prescription-gated at most pharmacies, restricted or de-listed by large online retailers, and subject to periodic manufacturing shortages, so general-purpose stores rarely carry it. New-U stocks it as a standard research accessory alongside the peptide catalogue, in USP-grade sealed multi-dose vials, so the solvent and the compound can be sourced together. Supplied for laboratory research only.
Can I buy bacteriostatic water internationally (UK, EU, Australia, Canada and worldwide)?
Yes. New-U ships bacteriostatic water discreetly worldwide, direct from source, in approximately 6-14 business days, with free shipping on orders over $300. Regulatory status varies by country, so buyers are responsible for compliance in their own jurisdiction. Supplied strictly as a research reconstitution solvent - not for human use.
How many vials of bacteriostatic water do I need for my peptides?
A common research rule of thumb is roughly one bacteriostatic water vial per five lyophilised peptide vials: 1-2 mL typically reconstitutes a single peptide vial, and a multi-dose vial can be drawn from over its 28-day opened shelf life. The exact number depends on your vial sizes and target concentrations. New-U includes free bacteriostatic water with peptide orders at a 1-per-5 ratio and sells additional 10-vial packs separately. For laboratory research use only.
Should I buy 3 ml or 10 ml bacteriostatic water vials?
Both sizes are the same USP-grade water with 0.9% benzyl alcohol - the choice is about workflow. 3 ml vials suit short single-peptide protocols: at 1-2 mL per reconstitution a vial covers one or two peptide vials, and you discard less when the 28-day opened shelf life runs out. 10 ml vials offer the best per-mL rate and suit multi-peptide protocols or labs reconstituting frequently, since one vial covers five or more peptide vials within its 28-day window. Both ship as sealed 10-vial packs. For laboratory research use only.
Where can I buy Bacteriostatic Water?
Right here — Bacteriostatic Water is supplied directly by New-U Research Compounds on this page as a USP-grade sterile solution in sealed, tamper-evident multi-dose vials — no prescription required — and shipped direct from source worldwide in discreet, tracked packaging. Strictly for laboratory research use only — not for human use.
How much does Bacteriostatic Water cost?
Bacteriostatic Water pricing is shown live on this page, per pack size — multi-vial packs as standard, with single-vial options where listed. Shipping is free on orders over $300.
Is Bacteriostatic Water USP grade?
Yes. Bacteriostatic Water is supplied as a USP-grade sterile solution in sealed, tamper-evident multi-dose vials, batch-controlled and supplied strictly for laboratory research — not for human use.
How do I buy Bacteriostatic Water?
Add the Bacteriostatic Water pack size you need to your cart and check out: enter your shipping details, then choose your payment method — cryptocurrency or card — on the next step. Every order ships with its batch Certificate of Analysis (COA). Bacteriostatic Water is supplied strictly for laboratory research use only, not for human or veterinary use.
What payment methods can I use to buy Bacteriostatic Water?
At checkout you can pay by cryptocurrency (BTC, ETH, SOL, LTC, USDC, USDT and more) or by card, each handled by a dedicated secure payment provider. You choose your method after confirming your order.
How fast is shipping, and do you ship worldwide?
Yes — we ship worldwide in discreet, unmarked, temperature-stable, tracked packaging. Delivery typically takes 6–14 business days, and shipping is free on orders over $300.
Is it legal to buy Bacteriostatic Water?
Bacteriostatic Water is supplied as a research accessory for laboratory use. Pharmacy-dispensed equivalents are prescription-gated in some jurisdictions; the research-grade supply on this page is sold strictly for laboratory use — buyers are responsible for compliance in their own region.
Pharmacokinetics
Source References & Further Reading
Last reviewed: 16 June 2026 · New-U Research Compounds
Key Characteristics
Specifications
About Bacteriostatic Water: Peptide Reconstitution Research Guide
Bacteriostatic water is the unglamorous but essential piece of equipment for any peptide research protocol. Virtually every peptide on this site is shipped as a lyophilised powder, which preserves the molecule's structure and dramatically extends shelf life. But before you can actually use the peptide, you need to reconstitute it in a sterile solvent - and bacteriostatic water is the standard solvent of choice for that job across the entire research peptide field.
The key feature is the 0.9% benzyl alcohol preservative. Plain sterile water for injection is single-use because any residual bacteria introduced during withdrawal can grow over time. Benzyl alcohol at 0.9% inhibits that growth strongly enough that a multi-dose vial remains sterile for 28 days at refrigerator temperatures, which matches the typical timeline for a single-vial peptide research protocol.
New-U Research Compounds supplies bacteriostatic water as USP-grade, sealed, tamper-evident vials designed for research peptide reconstitution. Proper handling matters: draw the desired volume with a sterile syringe, inject slowly against the inner wall of the peptide vial at an angle, and swirl gently - do not shake, as vigorous agitation can denature peptides. Nothing on this page is medical advice.
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