Peptide Calculator
Enter your compound, vial amount, BAC water, and desired dose — get the exact syringe mark to draw to.
Bacteriostatic water (BAC water) contains 0.9% benzyl alcohol as a preservative. This allows the reconstituted peptide to remain stable in the vial for multi-dose use — typically up to 28 days refrigerated.
Sterile water has no preservative and is single-use only. Once opened and drawn, the remaining solution should be discarded.
- Wipe the rubber stopper of the peptide vial with an alcohol swab. Allow to dry.
- Draw the required volume of BAC water into a syringe.
- Insert the needle into the peptide vial at an angle. Aim the stream at the glass wall — do not shoot directly onto the powder, which can damage the peptide structure.
- Gently swirl the vial (never shake) until the powder is fully dissolved. The solution should be clear.
- If the solution is cloudy, has visible particles, or has an unusual color — do not use it.
- Label the vial with the reconstitution date and concentration.
A U-100 insulin syringe holds 100 units per mL. Each tick mark = 1 unit = 0.01 mL = 10 µL.
A U-40 insulin syringe holds 40 units per mL. Each tick mark = 1 unit = 0.025 mL = 25 µL.
For very small doses (under 5 units), consider a 0.3 mL low-dead-space syringe for better measurement precision. The smaller barrel allows finer control.
Once reconstituted, store vials refrigerated (36–46°F / 2–8°C). Keep upright. Avoid temperature fluctuations.
Reconstituted peptides are generally stable for 3–4 weeks refrigerated when prepared with BAC water. Lyophilized (dry) peptide is stable for months to years when stored frozen.
Never freeze a reconstituted peptide. Freeze-thaw cycles break peptide bonds and degrade potency. If you must store long-term, keep the lyophilized powder frozen and reconstitute as needed.
Protect from light. Most peptides are light-sensitive once in solution. Store in amber vials or in a dark refrigerator.