Peptide Reconstitution Calculator
Enter the vial contents, the bacteriostatic water and your target dose. We tell you exactly how many units to draw on an insulin syringe.
Common doses
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What is concentration?
It is how much peptide there is per milliliter of liquid (mg/ml). More water = lower concentration = more units per dose.
U-100 syringe
Insulin syringes use the U-100 scale: 100 units = 1 ml. That is why doses are measured in "units".
Step-by-step reconstitution
Add bacteriostatic water slowly down the vial wall, never shake, swirl gently, and store the reconstituted peptide refrigerated.
Frequently asked questions
How do you calculate a reconstituted peptide dose?
Divide the milligrams in the vial by the milliliters of bacteriostatic water to get the concentration (mg/ml). Then divide your target dose by that concentration and multiply by 100 to get the units on a U-100 insulin syringe. The calculator does this math for you.
How much bacteriostatic water should I add to a peptide vial?
There is no fixed amount — it depends on the vial size and the precision you want. More water makes small doses easier to measure (more units per dose); less water concentrates the solution. A typical range is 1–3 ml per vial. Enter the water you plan to use and the calculator tells you exactly how many units to draw.
What is a U-100 syringe and why does it matter?
Insulin syringes use the U-100 scale: 100 units equals 1 ml. That is why peptide doses are measured in "units" on the syringe rather than milligrams. The calculator converts your dose in mg into U-100 units.
Does this work for BPC-157, TB-500, GHK-Cu and other peptides?
Yes. Reconstitution math is identical for any lyophilized peptide — only the vial milligrams and your target dose change. It works for BPC-157, TB-500, GHK-Cu, CJC-1295, MOTS-C and any powdered peptide.
How long does a reconstituted peptide last and how is it stored?
Once reconstituted with bacteriostatic water, store the peptide refrigerated (2–8 °C); it typically stays stable for several weeks. Bacteriostatic water contains benzyl alcohol that inhibits bacterial growth; plain sterile water lasts much less.
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