Bacteriostatic Water 10mL

Bacteriostatic Water 10mL is the diluent of choice for reconstituting lyophilized peptide and small-molecule research compounds at the bench. The product comprises sterile USP-grade water combined with 0.9 percent benzyl alcohol — a small organic compound that functions as a bacteriostatic preservative, slowing bacterial growth in the multi-dose vial without killing existing bacteria outright (the distinction between bacteriostatic and bactericidal preservatives matters in supply-chain contexts).

The 0.9 percent benzyl alcohol concentration is the USP-mandated specification for bacteriostatic water for injection. This concentration is sufficient to suppress bacterial growth across the typical multi-dose working window — usually 28 days from first vial puncture under USP guidelines — while remaining low enough to avoid the toxicity associated with higher benzyl alcohol concentrations. Researchers reconstituting peptides in benzyl-alcohol-containing diluents should be aware that benzyl alcohol exposure may interact with experimental endpoints in some cell-culture or animal-model contexts; sterile water for injection (without benzyl alcohol) is an alternative diluent for those research contexts where benzyl alcohol presence is undesirable.

Each vial holds 10 millilitres of bacteriostatic water in a sealed multi-dose vial format with rubber stopper. The vial format supports multiple needle-punctures across the working life of the product, with each puncture introducing a small amount of air and potential for contamination — the benzyl alcohol component limits the consequences of these incidental contamination events. Researchers should sanitise the rubber stopper with an alcohol swab before each puncture to minimise contamination risk further.

The product is compatible with the full Ronin peptide and small-molecule research catalog. Each peptide product page provides per-compound reconstitution math — typically 2 mL of bacteriostatic water added to a 10 mg lyophilized peptide vial yields a 5 mg/mL working concentration; per-component math varies for different vial loadings (50 mg GHK-Cu vials, 5 mg AOD-9604 vials, 80 mg KLOW Blend vials, etc.). Use the Ronin reconstitution calculator for non-standard math.

The product is supplied as a sealed glass vial with rubber stopper and aluminum-flip cap, packaged in protective outer wrap. Unopened shelf life is approximately 24 months at room temperature; refrigeration is not required for the unopened vial. After first puncture, the 28-day USP rule applies — the bacteriostatic activity of the benzyl alcohol declines slowly over time as the preservative metabolises, and after 28 days the vial should be considered for disposal regardless of remaining volume.

Bacteriostatic water is a USP-grade pharmaceutical excipient, not a research compound. The product is used as the diluent for research compounds across the Ronin catalog and is also used clinically in healthcare settings as a multi-dose injection diluent under appropriate medical supervision. The version supplied here through Ronin Peptides is intended exclusively for laboratory and research use as a peptide-reconstitution diluent. The product should not be administered to humans or animals outside of properly authorised clinical contexts.

Benzyl alcohol — the active preservative component at 0.9 percent — is a small aromatic alcohol with documented antimicrobial activity at concentrations above approximately 0.5 percent. The compound diffuses into bacterial cell membranes and disrupts membrane integrity at sub-lethal concentrations, slowing bacterial replication without killing existing bacteria outright. The "bacteriostatic" classification reflects this growth-suppression rather than direct-killing activity.

The USP 28-day rule for bacteriostatic water reflects the practical balance between two opposing factors. First, benzyl alcohol metabolises slowly over time in the aqueous solution and at the rubber-stopper interface, gradually reducing the preservative concentration. Second, each needle puncture introduces small amounts of microorganisms from the surrounding environment, increasing the bioburden inside the vial. After approximately 28 days these factors combine to leave the vial at risk of bacterial contamination beyond the preservative's growth-suppression capacity.

The 0.9 percent concentration was selected by USP after balancing antimicrobial efficacy against benzyl-alcohol toxicity. Higher concentrations show stronger antimicrobial activity but introduce systemic toxicity concerns, particularly in pediatric clinical contexts where benzyl-alcohol "gasping syndrome" was historically documented in neonates given high-dose benzyl-alcohol-containing intravenous formulations. The 0.9 percent concentration is below the threshold for systemic toxicity at typical multi-dose injection volumes.

The aqueous water carrier is USP-grade — meaning it meets the United States Pharmacopeia specification for water for injection: extensively purified by distillation or reverse osmosis followed by additional purification steps, with strict limits on dissolved minerals, organic contaminants, and bacterial endotoxins. USP-grade specifications are more stringent than ordinary distilled water specifications, reflecting the use of this water as an injectable pharmaceutical excipient.

Bacteriostatic Water is the standard reconstitution diluent for every lyophilized peptide and small-molecule research compound in the Ronin catalog. Per-compound reconstitution math depends on the vial loading and the working concentration the researcher wants to draw. Common patterns:

• 10 mg peptide vial + 2 mL bacteriostatic water → 5 mg/mL working concentration (BPC-157, TB-500, MOTS-c, Ipamorelin, Epitalon, Selank, Semax, KPV, CJC-1295 No DAC, Tesamorelin, 5-Amino-1MQ).
• 50 mg peptide vial + 5 mL bacteriostatic water → 10 mg/mL working concentration (GHK-Cu).
• 5 mg peptide vial + 2 mL bacteriostatic water → 2.5 mg/mL working concentration (AOD-9604).
• 500 mg vial + 5 mL bacteriostatic water → 100 mg/mL working concentration (NAD+).
• Blend vials use per-component reconstitution math — see each blend's product page (Wolverine Stack, Glow Blend, KLOW Blend, CJC-1295 + Ipamorelin Blend) for specifics.

The Ronin reconstitution calculator at /calculators/ handles arbitrary vial-size and diluent-volume combinations, converting target doses to U-100 insulin syringe units automatically. Each research-compound product page on the Ronin catalog includes its own per-compound reconstitution accordion documenting the specific math.

For research contexts where benzyl alcohol presence may interfere with experimental endpoints, sterile water for injection (without benzyl alcohol) is an alternative diluent. Research framings particularly sensitive to benzyl-alcohol exposure include certain cell-culture cytotoxicity assays, neonatal-physiology studies, and some pharmacokinetic work where the diluent's metabolites may be confounding. For most peptide-research contexts, bacteriostatic water is the standard choice and the benzyl-alcohol component is not a concern.

The product is supplied USP-grade with documented sterility and benzyl-alcohol concentration. A Certificate of Conformance (COC) accompanies each batch, documenting USP-compliance specifications. To request a COC for the batch you received, email Ronin support with your order number.

Cross-stream research framings have continued to refine bacteriostatic-water best-practice guidelines. USP regulatory updates have refined the 28-day rule across various clinical and research contexts. Peptide-research community guidance has emphasised the rubber-stopper sanitisation step and the avoidance of repeated needle punctures where possible. Researchers planning new experimental protocols should consult both USP guidelines and current peptide-research best-practice references.

Bacteriostatic water is a USP-grade pharmaceutical excipient — it is regulated as a multi-dose injection diluent in clinical contexts and used as a peptide-reconstitution diluent in research-supply contexts. The product supplied through Ronin is intended exclusively for the latter use. Documentation of USP-grade compliance is provided on each batch's Certificate of Conformance.

Unopened bacteriostatic water vials store at room temperature with no refrigeration required. Avoid direct heat exposure (sustained temperatures above 40 degrees Celsius), direct UV exposure, and freezing. The product is shelf-stable for approximately 24 months from manufacturing under typical room-temperature conditions.

Once the rubber stopper is first punctured, the 28-day USP rule applies — the vial should be considered for disposal 28 days after first puncture regardless of remaining volume. The benzyl alcohol preservative metabolises slowly over time and the preservative concentration declines, while each needle puncture introduces small amounts of microorganisms from the surrounding environment.

Standard sterile-handling practices apply: sanitise the rubber stopper with an alcohol swab before each needle puncture; use sterile, single-use syringes for each draw; minimise the number of needle punctures by drawing larger volumes when possible.

Visual inspection at each use should confirm the contents remain transparent and colourless. Any cloudiness, suspended particulate, yellow tint, or visible precipitate indicates contamination or degradation — discard the vial immediately. Do not attempt to filter or otherwise rescue contaminated bacteriostatic water; the cost of a fresh vial is trivial compared with the experimental risk of using compromised diluent.

Disposal of used vials follows institutional protocols — typically biohazard waste streams for vials that have been in contact with peptides or biological materials, and chemical-waste streams for unused vials past their working window.

Bacteriostatic Water is the standard diluent across most peptide-research workflows due to its multi-dose convenience. Sterile Water for Injection (SWFI) is the alternative when benzyl-alcohol presence may interfere with experimental endpoints — researchers in those contexts source SWFI separately or through medical-supply channels. Saline-based diluents are used in narrower research contexts where the 0.9 percent saline tonicity matters for delivery (intra-articular research, certain animal-model contexts).

Standard procedure for reconstituting a lyophilized peptide vial with bacteriostatic water:

1. Bring both vials — peptide and bacteriostatic water — to room temperature before opening. This prevents condensation forming on cold stopper surfaces during the procedure.
2. Sanitise both rubber stoppers with an alcohol swab. Allow alcohol to dry briefly before puncturing.
3. Pull the chosen diluent volume into a sterile transfer syringe through the bacteriostatic water vial's rubber stopper.
4. Direct the water against the inner wall of the peptide vial as it is injected — never onto the lyophilized cake itself, since direct impact foams the peptide solution and denatures peptide structure at the air-water interface.
5. Invert slowly or swirl gently until everything dissolves. Do not vortex; do not shake. Most peptide reconstitutions reach full dissolution within 30-60 seconds of gentle agitation.
6. Refrigerate the reconstituted peptide solution at 2-8 °C immediately after reconstitution. The bacteriostatic water vial itself can stay at room temperature.

For dose-volume calculations on insulin syringes, use the Ronin peptide reconstitution calculator. The calculator handles arbitrary vial-size and diluent-volume combinations and converts target doses to U-100 insulin syringe units automatically.

One bacteriostatic water vial typically supports multiple peptide reconstitutions across the 28-day post-puncture working window. A 10 mL vial provides enough diluent for 4-5 standard 2-mL reconstitutions of separate peptide vials. Ronin's 5-pack format is the standard option for researchers working with multiple peptide compounds simultaneously.

Researchers should not use ordinary distilled water, tap water, or non-USP-grade water for peptide reconstitution. The lower purity grades introduce dissolved minerals, organic contaminants, and bacterial endotoxins that can interfere with experimental endpoints in subtle ways. The cost difference between USP-grade bacteriostatic water and lower-grade alternatives is small relative to the experimental risk of using sub-spec diluent.

1. United States Pharmacopeia (USP). Bacteriostatic Water for Injection USP — official monograph for the product specification.
2. USP General Chapter <797> Pharmaceutical Compounding — Sterile Preparations covers multi-dose vial handling protocols including the 28-day rule.
3. FDA guidance on benzyl alcohol toxicity in preservative formulations — historical context for the 0.9 percent concentration selection.
4. Ronin Peptides reconstitution calculator at /calculators/ — handles per-peptide reconstitution math for the full Ronin catalog.
5. Per-compound product pages across the Ronin catalog provide compound-specific reconstitution accordions documenting standard diluent volumes and working concentrations.