Research-grade compound. Laboratory use only. Not intended for human or animal use, ingestion, or injection. No medical claims are made or implied.
Bacteriostatic Water
This report covers the 10ml lot. Other sizes ship to our supplier batch specification.
3–7 days most of the EU · 8–14 Nordics/Baltics
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USP-grade bacteriostatic water (3ml) with 0.9% benzyl alcohol. Sterile, endotoxin-tested. For peptide reconstitution.
| Quantity | Price Each | Total | Savings |
|---|---|---|---|
| 1 unit | €5.99 | €5.99 | -- |
| 3+ | €5.69 | €17.07 | 5% off |
| 5+Most Popular | €5.39 | €26.96 | 10% off |
| 10+ | €5.09 | €50.92 | 15% off |
Important Notice
This product is intended for laboratory and research use only. Not for human or veterinary use. By purchasing, you confirm this product will be used exclusively for in-vitro research purposes.
When This Product May Not Suit Your Research
- ⚠If your research requires GMP-grade material for clinical applications — research-grade peptides are not intended for clinical use.
- ⚠If your lab lacks proper cold storage (-20°C freezer) — this peptide's stability may be compromised at higher temperatures.
- ⚠If your study protocol requires FDA-approved reference standards — contact USP or a certified reference material provider.
Published laboratory reports are available for selected lots. Check each report for its result and stated method. For research purposes only.
This report covers the 10ml lot. Other sizes ship to our supplier batch specification.
24h dispatch, EU-wide shipping from €4.99
Supplier batch specification on every product; independent Janoshik report on selected lots
About Bacteriostatic Water
Bacteriostatic water is sterile water containing 0.9% benzyl alcohol (9mg per ml) as a bacteriostatic preservative. It is the standard reconstitution medium for research peptides that will be stored after preparation and used over multiple sessions. The benzyl alcohol does not sterilize -- it does not kill existing contamination -- but it prevents bacterial growth from needle punctures and environmental exposure, extending the usable window of a reconstituted peptide solution to approximately 28-30 days when kept refrigerated.
When to Use Bacteriostatic Water
Any peptide protocol that involves reconstituting a vial and using it for multiple doses over days or weeks should use bacteriostatic water. The alternative -- sterile water -- has no preservative action and is appropriate only for single-use, immediate-consumption reconstitutions. In practice, most research protocols involving peptides dosed repeatedly in animal studies or kept as working stocks in cell culture work default to bacteriostatic water for this reason.
One consideration: benzyl alcohol is biologically active at higher concentrations. At 0.9% in a reconstitution vial, the contribution to a typical in vivo dose or in vitro working concentration is negligible. However, if you are performing a sensitive cell viability assay or working with very high volumes of reconstituted solution per experiment, it is worth calculating the final benzyl alcohol concentration in the experimental medium and comparing to known cytotoxicity thresholds (generally above 0.1% in culture).
Specifications
| Parameter | Value |
|---|---|
| Volume | 10ml vial |
| Preservative | 0.9% benzyl alcohol (9mg/ml) |
| pH | 4.5 - 7.0 |
| Sterility | Sterile filtered |
| Endotoxins | <0.5 EU/ml |
Storage
Store unopened vials at room temperature or at 4°C, away from light. Once the vial septum has been punctured, refrigerate at 2-8°C and use within 28 days. Label with opening date. Discard if the solution becomes cloudy, discolored, or if visible particulates appear -- all of which indicate contamination despite the preservative. Do not freeze bacteriostatic water as this can cause precipitation.
Can bacteriostatic water be used for every type of peptide?
For the vast majority of synthetic research peptides, yes. The main exceptions are highly acid-sensitive or base-sensitive sequences where the pH 4.5-7.0 range of bacteriostatic water could affect stability, and some labile peptides where even the small amount of benzyl alcohol might interfere with the assay. For most standard peptides -- BPC-157, TB-500, GLP-1 analogues, growth hormone peptides, CJC-1295, Ipamorelin -- bacteriostatic water is fully compatible and is the recommended reconstitution medium.
How is reconstitution volume related to working concentration?
That is determined by the working concentration your assay requires, not by the solvent. Concentration is simply the peptide mass in the vial divided by the volume of solvent added: 2mg reconstituted in 2ml gives 1mg/ml, and 5mg in 2.5ml gives 2mg/ml. Choose the volume that puts the compound in the concentration range your protocol calls for, and keep the total within the vial's capacity. Note that a larger reconstitution volume means a more dilute solution and a shorter usable window per the storage guidance above.
Bacteriostatic water is supplied for laboratory research use only. For research purposes only.
Specification Summary
About Bacteriostatic Water
Bacteriostatic water is sterile water containing 0.9% benzyl alcohol (9mg per ml) as a bacteriostatic preservative. It is the standard reconstitution medium for research peptides that will be stored after preparation and used over multiple sessions. The benzyl alcohol does not sterilize -- it does not kill existing contamination -- but it prevents bacterial growth from needle punctures and environmental exposure, extending the usable window of a reconstituted peptide solution to approximately 28-30 days when kept refrigerated.
When to Use Bacteriostatic Water
Any peptide protocol that involves reconstituting a vial and using it for multiple doses over days or weeks should use bacteriostatic water. The alternative -- sterile water -- has no preservative action and is appropriate only for single-use, immediate-consumption reconstitutions. In practice, most research protocols involving peptides dosed repeatedly in animal studies or kept as working stocks in cell culture work default to bacteriostatic water for this reason.
One consideration: benzyl alcohol is biologically active at higher concentrations. At 0.9% in a reconstitution vial, the contribution to a typical in vivo dose or in vitro working concentration is negligible. However, if you are performing a sensitive cell viability assay or working with very high volumes of reconstituted solution per experiment, it is worth calculating the final benzyl alcohol concentration in the experimental medium and comparing to known cytotoxicity thresholds (generally above 0.1% in culture).
Specifications
| Parameter | Value |
|---|---|
| Volume | 10ml vial |
| Preservative | 0.9% benzyl alcohol (9mg/ml) |
| pH | 4.5 - 7.0 |
| Sterility | Sterile filtered |
| Endotoxins | <0.5 EU/ml |
Storage
Store unopened vials at room temperature or at 4°C, away from light. Once the vial septum has been punctured, refrigerate at 2-8°C and use within 28 days. Label with opening date. Discard if the solution becomes cloudy, discolored, or if visible particulates appear -- all of which indicate contamination despite the preservative. Do not freeze bacteriostatic water as this can cause precipitation.
Can bacteriostatic water be used for every type of peptide?
For the vast majority of synthetic research peptides, yes. The main exceptions are highly acid-sensitive or base-sensitive sequences where the pH 4.5-7.0 range of bacteriostatic water could affect stability, and some labile peptides where even the small amount of benzyl alcohol might interfere with the assay. For most standard peptides -- BPC-157, TB-500, GLP-1 analogues, growth hormone peptides, CJC-1295, Ipamorelin -- bacteriostatic water is fully compatible and is the recommended reconstitution medium.
How is reconstitution volume related to working concentration?
That is determined by the working concentration your assay requires, not by the solvent. Concentration is simply the peptide mass in the vial divided by the volume of solvent added: 2mg reconstituted in 2ml gives 1mg/ml, and 5mg in 2.5ml gives 2mg/ml. Choose the volume that puts the compound in the concentration range your protocol calls for, and keep the total within the vial's capacity. Note that a larger reconstitution volume means a more dilute solution and a shorter usable window per the storage guidance above.
Bacteriostatic water is supplied for laboratory research use only. For research purposes only.
Researcher Confidence
Why researchers choose CertaPeptides
Who actually tests this?
Selected lots are independently verified by Janoshik Analytical (Czech Republic) and published on the Janoshik public portal. Other lots ship with the supplier's batch specification. See /coa for the published wall.
View COAs →What if I get the wrong batch?
Every bottle label carries a lot number that maps to a specific Certificate of Analysis. If a batch fails spec, we don't ship it — full stop.
View COAs →Where does it ship from?
Romania (EU). We are CERTALAB SRL, CUI 54169956, VAT-registered. Sameday for Romania, GLS for most EU destinations, TCE Worldwide for the remaining cross-border EU and non-EU markets (UK, Switzerland, Iceland, Serbia). Delivery 1–15 business days depending on destination — exact window shown at checkout.
Shipping details →What if there's a problem?
You have a 14-day withdrawal right under OUG 34/2014 (Romanian/EU consumer law), with ANPC/ODR escalation available. Contact us at support@certapeptides.com.
Returns policy →Product Information
This product is intended for scientific research and development purposes only. It is a chemical substance that shall not be used as a drug, medicine, active substance, or ingredient in any product intended for human or animal consumption. Researchers must handle this compound in accordance with their institutional biosafety guidelines. Use only in properly equipped laboratory settings with appropriate personal protective equipment.