USP-Grade Bacteriostatic (BAC) Water for Peptides — 10mL & 30mL

Buy USP-Grade BAC Water for Peptide Research

Bacteriostatic water, commonly called BAC water, is a USP-grade preserved aqueous solution used in laboratory peptide workflows where a research method requires repeated access to a prepared vial. It is formulated with 0.9% benzyl alcohol as a preservative, which is what lets a sealed vial be entered more than once under proper laboratory handling.

This product is supplied in sealed 10mL and 30mL vials. Choose a single 10mL vial, a 3-vial or 10-vial pack of 10mL vials, or a single 30mL vial. Every multi-vial pack is separate sealed 10mL vials — not one larger bottle. Current pricing for each option is shown above the Add to Cart button.

Ordering peptides? One 10mL BAC water vial is included free with every peptide vial order. Use this page to buy additional vials.

Bacteriostatic Water Product Specifications

Product	Bacteriostatic water, also called BAC water
Grade	USP
Vial volumes	10mL or 30mL
Available options	1, 3 or 10 separate 10mL vials, or one 30mL vial
Preservative	0.9% benzyl alcohol
Form	Sterile, non-pyrogenic aqueous solution
Container	Sealed multi-use vial
Storage	Store sealed at controlled room temperature, away from direct light and heat. After first entry, follow the product label and your laboratory procedure
Intended use	Controlled laboratory and analytical research
Human or veterinary use	Not intended for either

BAC Water vs Sterile Water, Saline and Acetic Acid Water

Researchers often ask which diluent a peptide protocol calls for. These solutions do different jobs and are not universal substitutes for one another:

Diluent	Main distinction	Preservative	Multi-use vial
Bacteriostatic (BAC) water	Preserved aqueous solution — the standard choice for reconstituting multi-use lyophilized peptides	0.9% benzyl alcohol	Yes, per label and lab procedure
Sterile water	Unpreserved sterile aqueous solution	None	No — single entry
0.9% sodium chloride (saline)	Isotonic diluent where benzyl alcohol must be avoided	None	No — single entry
0.6% acetic acid water	Acidified solvent for protocols that specify low-pH conditions	None	No

Follow the documentation for the exact compound and laboratory method being used. For the full comparison, read the Bacteriostatic Water for Peptides Guide.

Need Help Calculating Concentration?

The volume of BAC water added sets the concentration of the reconstituted solution (total mg ÷ mL added = mg/mL). Use the MyGLP1Store Reconstitution Calculator or read the complete Bacteriostatic Water for Peptides Guide for worked examples. Calculator results are concentration references for controlled research, not dosing instructions.

BAC water is the diluent shipped with BPC-157, retatrutide, tirzepatide, cagrilintide, KLOW blend, GHK-Cu and every other lyophilized peptide from MyGLP1Store.

Why Order BAC Water from MyGLP1Store?

• USP-grade bacteriostatic water in sealed 10mL and 30mL vials, with clearly labelled pack quantities
• Single-vial and discounted 3- and 10-vial options
• U.S.-based order fulfilment, Monday to Friday
• Ground, 2-Day and Next Day shipping
• One vial free with every qualifying peptide order
• Loyalty points on eligible purchases

Storage and Handling

Store sealed vials at controlled room temperature, away from direct sunlight and excessive heat. Storage and after-opening handling depend on the product label, manufacturer instructions and laboratory procedure — follow the documentation supplied with the applicable lot, and use sterile technique whenever a vial is entered.

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BAC Water for Peptides — Frequently Asked Questions

Where can I buy bacteriostatic water for peptides?

MyGLP1Store sells USP-grade bacteriostatic BAC water for laboratory peptide research in sealed 10mL and 30mL vials. Choose a single vial or a 3- or 10-vial pack directly on this page. It ships from the US and is free with every peptide vial order.

Where can I buy BAC water online?

BAC water can be ordered from this page in sealed 10mL vials. Current pricing, pack quantities, availability and shipping options are shown above the Add to Cart button.

Can I buy bacteriostatic water at CVS or Walgreens?

Retail pharmacies do not generally stock bacteriostatic water for laboratory use, and inventory and labelling vary by location. MyGLP1Store offers 10mL bacteriostatic water online for laboratory research, so you can order without relying on local pharmacy inventory.

Can bacteriostatic water be purchased over the counter?

Retail availability and intended-use labelling vary. MyGLP1Store sells this product online strictly for controlled laboratory and analytical research. It is not marketed for human or veterinary use.

What kind of BAC water is used for peptide research?

Look for a clearly labelled, USP-grade solution with documented ingredients, vial volume and storage conditions. This product is USP-grade, sterile, non-pyrogenic and contains 0.9% benzyl alcohol as a preservative, in sealed 10mL and 30mL vials.

Is BAC water the same as sterile water?

No. BAC water contains a bacteriostatic preservative, which is why it is suitable for vials that are entered more than once. Sterile water contains no preservative and is intended for single entry. They should not automatically be substituted for one another.

Is BAC water the same as acetic acid water?

No. Acetic acid water is an acidified solvent used only where a protocol specifies low-pH conditions, and it has no preservative. BAC water is the standard diluent for most lyophilized peptides. See the acetic acid water 0.6% listing if your method calls for it.

How much bacteriostatic water do I use per peptide vial?

The volume you add sets the concentration. Divide the vial’s milligram amount by your protocol’s target concentration (mg/mL) to get the volume of BAC water to add, or use the reconstitution calculator. This is concentration math for laboratory research, not dosing guidance.

Do you sell 30mL bacteriostatic water?

Yes — a single sealed 30mL vial is available in the size selector above, alongside the 10mL options. Note that the 3-vial pack is three separate 10mL vials (30mL in total), not one 30mL bottle; choose “1 x 30mL Vial” if you want a single larger vial.

Is this USP-grade bacteriostatic water?

Yes. This is USP-grade bacteriostatic water — sterile, non-pyrogenic and preserved with 0.9% benzyl alcohol — supplied in sealed 10mL and 30mL vials for laboratory research use.

Is BAC water included with peptide orders?

Yes — one 10mL vial ships free with every peptide vial order. Additional single vials and multi-vial packs can be purchased separately on this page. See how the free BAC water offer works.