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Begin by selecting the amount of peptide you plan to inject per dose. This step is essential because it determines the exact volume of the final solution needed for each injection. Enter your desired dose in milligrams (mg).
Using the Bac Water Calculator, the system will automatically determine how much of the reconstituted peptide solution you need to draw per injection. This ensures your dosing is precise and consistent every time.
For small, daily doses requiring frequent injections, 1 mL or less of bacteriostatic water is usually sufficient, allowing for accurate micro-dosing.
For most standard peptide protocols (around 20 doses per vial), 2 to 3 mL of bacteriostatic water is commonly used. This dilution works well for:
For GLP-1 peptides like Semaglutide and Tirzepatide, which are highly potent and used in very small amounts, 0.5 to 1 mL of bacteriostatic water is typically enough for proper dilution.
Need help reconstituting peptides? Read our step-by-step Retatrutide reconstitution guide.Problems with too little water:
Problems with too much water:
Everything you need to know about BAC water and peptide reconstitution.
For a 5 mg vial, adding 1 mL of bacteriostatic water yields a concentration of 5 mg/mL, meaning each 0.1 mL drawn equals 0.5 mg. If you need finer dose control, use 2 mL for a 2.5 mg/mL concentration, where each 0.1 mL equals 0.25 mg. Use the calculator above to fine-tune for your exact dose.
For a 10mg vial, 2 mL is the most common volume, yielding a 5 mg/mL concentration. Each 0.1 mL drawn gives 0.5 mg. For smaller, more precise doses, use 4 mL (2.5 mg/mL); 0.1 mL = 0.25 mg. Adjust using the calculator above to match your target dose.
The formula is: BAC Water (mL) = Vial Size (mg) ÷ Desired Concentration (mg/mL). For example, a 10mg vial at a target concentration of 5 mg/mL requires 10 ÷ 5 = 2 mL of bacteriostatic water; a higher desired concentration requires less water. Our calculator handles this automatically.
Bacteriostatic water is sterile water preserved with 0.9% benzyl alcohol. The benzyl alcohol prevents bacterial growth, making it safe for multiple withdrawals from the same vial. It keeps reconstituted peptides stable for up to 28–30 days when refrigerated. Plain sterile water has no preservative and is single-use only.
Most peptides remain stable for 28–30 days when stored at 2–8°C. Keep the vial refrigerated and away from light between uses. Discard the solution if it looks cloudy, discolored, or has visible particles. Keep unreconstituted powder frozen at -20°C until you are ready to use it.
Too much BAC water lowers the concentration, forcing larger draw volumes per dose. Large volumes are harder to measure accurately and can cause more discomfort at the injection site. A diluted vial also takes longer to finish, increasing the risk of expiry before it is fully used. Always aim for a concentration where each dose fits within a small, measurable volume in a syringe.
Under-dilution produces a highly concentrated solution, requiring very small volumes to be drawn per dose. Volumes under 0.05 mL are extremely difficult to measure accurately on an insulin syringe, significantly increasing the risk of dosing errors. Small miscalculations become disproportionately impactful at high concentrations.
On a standard 1 mL insulin syringe, 1 mL = 100 units. To convert: multiply your required mL volume by 100. Examples: 0.05 mL = 5 units, 0.1 mL = 10 units, 0.2 mL = 20 units, 0.5 mL = 50 units. Our calculator automatically shows the syringe units alongside the mL result, so you never need to do this manually.
Sterile water can be used for reconstitution, but it contains no preservatives. This means the vial must be treated as single-use and discarded immediately after each withdrawal to prevent contamination. Bacteriostatic water is strongly preferred for multi-dose research vials because its benzyl alcohol content prevents bacterial contamination across multiple uses over 28–30 days.
For GLP-1 peptides like Semaglutide and Tirzepatide, 0.5–1 mL of bacteriostatic water is typically used per vial. These peptides are highly potent, and doses are very small (often 0.25–2.4 mg), so a higher-concentration solution allows for more accurate small-volume dosing with a standard syringe without needing to draw unrealistically tiny amounts.
Scientific references support the information on this page.
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