Instantly calculate your syringe draw, concentration, and total doses from any peptide vial. Enter your reconstitution details below for precise, instant results.
Enter your vial size, water volume, and desired dose to see your results instantly.
For informational and research purposes only. This calculator does not constitute medical advice. Dosing calculations are mathematical estimates based on your inputs. Always consult a qualified healthcare provider before using any peptide compound. Results may vary based on measurement precision and reconstitution technique.
A simple, step-by-step overview for research preparation.
You'll need your peptide vial, bacteriostatic water (BW), an insulin syringe, alcohol swabs, and a clean work surface. Always use bacteriostatic water — not sterile water — for multi-use vials.
Swab the rubber stopper of both vials with an alcohol swab. Draw your desired volume of bacteriostatic water into the syringe, then inject it slowly down the side of the peptide vial — never directly onto the powder.
Do not shake the vial. Gently swirl or roll it between your palms until the peptide is fully dissolved. The solution should be clear. Store reconstituted peptides in the refrigerator (2–8°C).
Use the calculator above to find exactly how many units to draw on your insulin syringe for your desired dose. The result accounts for your vial size and water volume.
Swab the reconstituted vial stopper, insert the syringe, and draw back to the calculated unit mark. Remove air bubbles by gently tapping the syringe and pressing the plunger slightly.
Use the Remaining Doses Tracker in the calculator above to log each injection. This helps you know exactly how many doses remain in your vial without guesswork.
Bacteriostatic water (BW) contains 0.9% benzyl alcohol, which inhibits bacterial growth. This makes it safe for multi-use vials — unlike plain sterile water, which must be used within a single session. Always use bacteriostatic water for peptide reconstitution to maintain sterility over multiple injections.
The amount of bacteriostatic water you add determines your concentration and therefore your syringe draw. Common choices are 1–2 mL per vial. Adding more water makes each unit on the syringe represent a smaller dose (easier to measure small doses). Adding less water means each unit represents a larger dose. Use the calculator to find the exact draw for your chosen volume.
A 100-unit insulin syringe holds 1 mL total. Each unit equals 0.01 mL. So if the calculator says "draw to 10 units," that means you draw 0.10 mL of solution. A 50-unit syringe holds 0.5 mL (each unit = 0.01 mL), and a 30-unit syringe holds 0.3 mL (each unit = 0.01 mL). The unit-to-volume ratio is the same across syringe sizes — only the total capacity differs.
Reconstituted peptides stored in the refrigerator (2–8°C) with bacteriostatic water typically remain stable for 4–6 weeks. Lyophilized (freeze-dried) peptides in sealed vials can last much longer when stored correctly. Avoid freeze-thaw cycles on reconstituted vials, and always keep them away from light and heat.
Small draws (e.g., 1–5 units) are normal for high-potency peptides or when using a smaller water volume. If your draw is less than 5 units, consider adding more bacteriostatic water to dilute the solution further — this makes the dose easier to measure accurately. For example, doubling the water volume doubles the units you need to draw, reducing measurement error.
The calculator uses standard pharmaceutical reconstitution math and is mathematically accurate based on your inputs. However, real-world accuracy depends on the precision of your measurements — the actual volume of water drawn, the accuracy of your syringe markings, and the purity of the peptide. Always verify your inputs carefully, and consult a healthcare provider for guidance on your specific research protocol.
Every Vital Peps compound is third-party tested by accredited laboratories, with full COA results published publicly. Research-grade purity you can verify.