{"id":68832,"date":"2026-02-25T15:44:55","date_gmt":"2026-02-25T15:44:55","guid":{"rendered":"https:\/\/medsbase.com\/?post_type=product&p=68832"},"modified":"2026-05-13T09:49:35","modified_gmt":"2026-05-13T09:49:35","slug":"bac-water","status":"publish","type":"product","link":"https:\/\/medsbase.com\/nl\/bac-water\/","title":{"rendered":"BAC Water (Bacteriostatisch Water)"},"content":{"rendered":"

If you need bacteriostatic water alongside lyophilised peptides for a full reconstitution kit, our Peptide Healing Stack (BPC-157 5 mg + TB-500 5 mg + BAC water)<\/a> bundles both peptides with the reconstitution water in one parcel \u2014 useful for users running combined recovery protocols.<\/p>\n

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Quick Answer \u2014 What is Bacteriostatic Water?<\/h3>\n

Bacteriostatic (BAC) water is sterile, non-pyrogenic water containing 0.9% benzyl alcohol as a preservative. The benzyl alcohol inhibits microbial growth, which means the same multi-use vial can be accessed repeatedly under proper sterile technique \u2014 unlike plain sterile water, which must be discarded after a single puncture. It is the standard diluent for reconstituting lyophilized research peptides such as BPC-157, TB-500, GHK-Cu, Semax, and Adamax.<\/p>\n<\/div>\n

BAC Water \u2014 Sterile Multi-Dose Diluent for Research Peptides<\/h2>\n

Bacteriostatic Water for Injection is the single most common reconstitution fluid used in peptide research. It is pharmaceutical-grade sterile water to which 0.9% benzyl alcohol has been added as a bacteriostatic preservative. That small but critical addition is what allows a single 10 mL vial to be punctured and drawn from multiple times over a 28-day period without microbial contamination \u2014 a practical advantage in any laboratory protocol that requires repeated dosing from lyophilized peptide stock.<\/p>\n

Every peptide sold on MedsBase arrives freeze-dried (lyophilized). Before use, the powder must be dissolved in a compatible liquid to produce a solution that can be measured by volume. BAC Water is the industry-standard choice because it delivers three properties simultaneously: sterility, pyrogen-free status, and multi-dose compatibility.<\/p>\n

Why Bacteriostatic Water Rather Than Sterile Water?<\/h2>\n

Sterile Water for Injection is plain water that has been filtered and autoclaved. Once the rubber stopper of a sterile-water vial is punctured by a needle, the contents should be used immediately and the vial discarded, because no preservative is present to suppress bacterial or fungal growth introduced by that puncture.<\/p>\n

Bacteriostatic Water adds 0.9% benzyl alcohol \u2014 a concentration well below any cytotoxic threshold but high enough to keep common environmental organisms (Staphylococcus epidermidis, Escherichia coli, Candida albicans) from proliferating in the residual liquid between draws. Research workflows that reconstitute a 5 mg peptide vial into 2 mL and then dose 200 \u00b5g increments every 24 hours over 10\u201325 days depend on this multi-dose capability.<\/p>\n

Reconstitution Protocol \u2014 Step by Step<\/h2>\n

The protocol below is the standard method used in peptide research laboratories. For a more detailed treatment of dilution math, concentration calculations, and troubleshooting, see our BAC Water reconstitutiegids<\/a>.<\/p>\n

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  1. Prepare the workspace.<\/strong> Wipe down a clean flat surface with 70% isopropyl alcohol. Wash hands and put on disposable gloves.<\/li>\n
  2. Inspect the vials.<\/strong> BAC Water should be clear and colorless. The lyophilized peptide should appear as a white or off-white powder or cake; any discoloration or visible particles means the vial should not be used.<\/li>\n
  3. Wipe both rubber stoppers with alcohol.<\/strong> Let them dry for 15\u201320 seconds \u2014 needle puncture through a still-wet stopper can push alcohol into the vial.<\/li>\n
  4. Draw up BAC Water into a syringe.<\/strong> The standard working dilution for most peptides is 2 mL of BAC Water per 5 mg of peptide, giving a final concentration of 2.5 mg\/mL (or 250 \u00b5g per 0.1 mL mark on an insulin syringe).<\/li>\n
  5. Inject the BAC Water gently down the side of the peptide vial.<\/strong> Do not squirt it directly onto the lyophilized powder \u2014 that can cause foaming and local denaturation. Let the liquid run down the inner glass wall.<\/li>\n
  6. Swirl gently \u2014 do not shake.<\/strong> Most peptides dissolve within 30\u201360 seconds of gentle swirling. Vigorous shaking generates air-water interface turbulence that can fragment peptide structures, particularly larger compounds like TB-500 and Thymosin Alpha-1.<\/li>\n
  7. Label the reconstituted vial.<\/strong> Write the reconstitution date on the vial. Refrigerated storage and use within 30 days is standard; beyond that, degradation products may accumulate.<\/li>\n<\/ol>\n

    Compatibility With Research Peptides<\/h2>\n

    BAC Water is compatible with essentially every research peptide sold on MedsBase, including:<\/p>\n