What is the difference between bacteriostatic water and sterile water?

Bacteriostatic water contains 0.9% benzyl alcohol as a preservative, which inhibits bacterial growth and allows the vial to be used multiple times safely over up to 28 days. Sterile water has no preservative and must be discarded immediately after opening to prevent contamination. For research protocols requiring repeated draws from the same vial, bacteriostatic water is the standard choice.

How long does bacteriostatic water last after opening?

An opened vial of bacteriostatic water remains safe for multi-dose use for up to 28 days when stored refrigerated at 2-8 degrees Celsius. Always label the vial with the date of first use and discard after 28 days or immediately if the solution appears cloudy or contains visible particulates.

How much bacteriostatic water do I use to reconstitute peptides?

The volume depends on the peptide quantity and your desired concentration. A common example: adding 1ml of bacteriostatic water to a 5mg peptide vial gives a 5mg/ml concentration. For a 2.5mg/ml concentration, add 2ml. Always calculate based on your specific research protocol. Typical volumes range from 1ml to 10ml depending on peptide amount and vial size.

What is benzyl alcohol and why is it used in bacteriostatic water?

Benzyl alcohol is a naturally occurring aromatic alcohol used as a bacteriostatic preservative. At a concentration of 0.9%, it inhibits the growth of bacteria without affecting the sterility or pH of the water. This allows multiple needle insertions into the same vial over 28 days without risk of microbial contamination, making it ideal for research reconstitution protocols.

Should I use a 10ml or 30ml vial for peptide reconstitution?

A 10ml vial is ideal for low-volume protocols (BPC-157, CJC-1295, Ipamorelin) where 1-6ml of BAC water is typically required. A 30ml vial is better suited for high-volume protocols (TB-500, HGH, multi-peptide studies) where 10ml or more is needed. For active labs reconstituting multiple compounds, 30ml vials in bulk packs offer the best value.

Where is Renew Lab Group bacteriostatic water manufactured?

All Renew Lab Group bacteriostatic water is manufactured in Houston, Texas. Products are produced under strict quality controls with batch-consistent sterility testing. Both 10ml and 30ml vials are available and ship fast from our Houston facility.

Can bacteriostatic water be frozen?

Unopened bacteriostatic water vials should not be frozen. After reconstituting peptides with BAC water, the resulting solution should be stored refrigerated at 2-8 degrees Celsius, not frozen. Freezing can disrupt peptide structure and reduce compound efficacy. Use within 28 days of reconstitution.

Is bacteriostatic water safe for research use?

Renew Lab Group bacteriostatic water is pharmaceutical grade and manufactured for laboratory and research purposes only. It is not intended for human consumption. Researchers should follow proper aseptic technique when handling vials, including using alcohol-swabbed stoppers, sterile syringes, and clean work surfaces.

Frequently Asked Questions

Name: Renew Lab Group
Address: Houston, TX, Houston, TX, 77000, US
Telephone: 936-379-5515
Price range: $$

Everything you need to know about bacteriostatic water, peptide reconstitution, HPLC testing, and ordering from Renew Labs Group.

About Bacteriostatic Water

What is bacteriostatic water?

Bacteriostatic water is sterile water containing 0.9% benzyl alcohol as a preservative. The benzyl alcohol inhibits bacterial growth, making the water safe for multi-dose use in research applications. It is used primarily as a diluent for reconstituting peptides and other research compounds.

How is bacteriostatic water different from sterile water?

Sterile water for injection is a single-use product — once the vial is opened, it must be discarded. Bacteriostatic water contains benzyl alcohol, which prevents bacterial contamination after opening, making it suitable for multi-dose withdrawals. This is why bacteriostatic water is preferred for peptide reconstitution in research settings.

What is the benzyl alcohol concentration in Renew Labs bacteriostatic water?

Our bacteriostatic water contains 0.91% benzyl alcohol, verified by HPLC analysis to meet the USP specification of 0.9% ± 0.1%. This precise concentration is confirmed in our batch-specific Certificate of Analysis (COA) for every production lot.

How should bacteriostatic water be stored?

Store at room temperature or refrigerated (2°C–25°C). Do not freeze. Keep away from direct sunlight. Once opened, use within 28 days. Batch BAC-26041201 has a retest date of April 12, 2028.

Quality & Testing

What does HPLC-verified mean?

High-Performance Liquid Chromatography (HPLC) is an analytical technique that separates, identifies, and quantifies compounds in a mixture. HPLC-verified means each batch has been tested using this method to confirm that the benzyl alcohol content is within specification (0.9% ± 0.1%) and that purity exceeds the NLT 98.0% requirement.

What is a Certificate of Analysis (COA) and can I see one?

A Certificate of Analysis (COA) is a quality document issued for each production batch that confirms the product meets all specified quality tests. Our COA for Batch BAC-26041201 shows: appearance (clear, colorless), benzyl alcohol content (0.91%), sterility (sterile), endotoxin (<0.1 EU/ml), pH (5.8), and particulate matter (conforms to USP <788>). You can view our current COA on our Lab Services page.

Is the product pyrogen-free?

Yes. Our bacteriostatic water is tested for endotoxins (pyrogens) using the Limulus Amebocyte Lysate (LAL) test. Our product specification requires NMT 0.25 EU/ml; our Batch BAC-26041201 result was <0.1 EU/ml — well below the acceptable limit.

Ordering & Shipping

What sizes and quantities are available?

We offer bacteriostatic water in 10ml and 30ml vials. Each size is available in 1-pack ($6.99 / $8.99), 2-pack ($11.99 / $16.99), 5-pack ($26.99 / $39.99), and 10-pack ($49.99 / $73.99) quantities. Bulk pricing provides significant savings per vial.

Where do you ship from, and how fast is shipping?

We ship from our facility in Houston, TX 77042. Orders are typically processed and shipped within 1–2 business days. We ship via USPS and UPS. Contact us at 936-379-5515 for expedited shipping inquiries.

Is this product for human use?

No. All products from Renew Labs Group are strictly for research and laboratory use only. They are not intended for human consumption, clinical use, or therapeutic application. By purchasing, you confirm that you are a qualified researcher and will handle these products appropriately in a laboratory setting.

Still Have Questions?

Our team is ready to help with technical questions, custom orders, and lab service inquiries.