Calculator
Peptide reconstitution calculator.
Translate your physician's prescription into an exact draw on a U-100 insulin syringe. Enter the peptide amount in your vial, the volume of bacteriostatic water you're using, and your prescribed dose. Results update as you type.
Your vial & dose
Results update automatically as you type.
What to draw
How reconstitution works
Most peptides ship as a lyophilized (freeze-dried) powder. Before they can be administered, the powder is dissolved in bacteriostatic water. The volume of water you add determines the concentration of the final solution, which is what tells you how much to draw per dose.
The four numbers that matter
- Peptide amount. The total milligrams (or micrograms, or IU) of peptide printed on the vial. This number does not change.
- Bacteriostatic water volume. How much BAC you add to the vial. More water makes a more diluted solution (larger draw per dose, easier to measure). Less water makes a more concentrated solution (smaller draw, more doses).
- Prescribed dose. The single-administration dose your physician prescribed.
- Insulin syringe units. A standard U-100 syringe is marked from 0 to 100 units, where 100 units equals exactly 1.0 mL.
The math, in one line
Units to draw = (dose ÷ vial amount) × BAC volume × 100. The calculator above performs this with unit conversions baked in.
A worked example
A 5 mg vial of Sermorelin reconstituted with 2 mL of bacteriostatic water yields a 2.5 mg/mL solution. A 250 mcg dose (0.25 mg) requires 0.1 mL — exactly 10 units on a U-100 syringe — and the vial holds 20 doses.
Educational tool — not medical advice.Always follow your physician's instructions and verify the math before administering any peptide. This calculator is a convenience for patients with an active prescription from an independently licensed physician. Pru does not recommend, prescribe, or supply peptides outside of an established physician-patient relationship. If this is a medical emergency, call 911.