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How peptide reconstitution math works
Concentration equals vial strength (mg) divided by the water added (mL). On a U-100 insulin syringe, 100 units equals 1 mL, so each unit is 0.01 mL and the milligram amount per unit is the concentration divided by 100. To hit a target dose, divide the dose by the mg-per-unit value. Adding more bacteriostatic water lowers the concentration and raises the number of units per dose, which improves dosing precision for very small research amounts.
Frequently asked questions
How do I calculate peptide reconstitution?
Divide the vial strength (mg) by the bacteriostatic water added (mL) to get concentration in mg/mL. On a U-100 insulin syringe, 100 units = 1 mL, so units for a target dose = target mg x 100 / concentration. This calculator does the math for you. Research use only.
What is bacteriostatic water?
Bacteriostatic water is sterile water with 0.9% benzyl alcohol that inhibits microbial growth, used to reconstitute lyophilized research peptides. The volume you add sets the final concentration.
How many units is my peptide dose?
Units depend on both the vial strength and the water volume added. Enter your vial mg, water mL, and target dose and the calculator returns the exact units to draw on a U-100 syringe.
Does adding more water change the dose?
No. More water changes the concentration and the number of units you draw, but not the milligram dose. More water = more units for the same mg, which improves precision for very small research doses.
Per-compound reconstitution reference · Full reconstitution guide · Research guides
External references: Bacteriostatic water (Wikipedia) · U.S. Food and Drug Administration