Peptide Reconstitution Calculator
Research Use OnlyEnter vial mass and diluent volume to derive concentration and U-100 syringe units.
How to read it: on a standard U-100 insulin syringe, 100 units = 1 mL. The “units” figure is where that draw volume lands on the barrel — an arithmetic conversion of the numbers you entered, not a recommendation of any amount.
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How reconstitution math works
Reconstitution is simply dissolving a lyophilized (freeze-dried) research peptide in bacteriostatic water so it can be measured by volume. The concentration is the vial mass divided by the water you add: a 10 mg vial in 2 mL of BAC water is 5 mg/mL. From there, any target draw is that amount divided by the concentration, and on a U-100 insulin syringe 1 mL reads as 100 units.
Worked example
10 mg vial ÷ 2 mL = 5 mg/mL. A 250 mcg target draw is 0.25 mg ÷ 5 mg/mL = 0.05 mL, which is 5 units on a U-100 barrel, giving 40 equal draws per vial. Change the water volume and the unit mark changes; the total peptide in the vial does not.
Bacteriostatic water
Most reconstitution references use bacteriostatic water (0.9% benzyl alcohol) for multi-draw storage. The amount of diluent does not change how much peptide is in the vial — only how far it spreads across the barrel, which changes how precisely small volumes can be measured.
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This tool performs reconstitution arithmetic (mass ÷ volume) for handling research materials in a laboratory setting. Concentration figures are derived solely from the vial mass and diluent volume you enter, drawing on publicly documented reconstitution conventions. It is not dosing guidance, not a treatment protocol, and the materials are not for human or veterinary use. Consult qualified professionals and primary literature for any research design.