Dosage calculator and reconstitution guide

The calculation relies on three simple steps, in order :

1. Concentration = amount of peptide (mg) ÷ volume of water added (ml). This is the "strength" of your solution once reconstituted.
2. Volume to draw = desired dose (mg) ÷ concentration (mg/ml).
3. Syringe reading = volume (ml) × 100, since a U-100 insulin syringe is graduated at 100 units per milliliter, regardless of its physical size.

In practice: a 10 mg vial reconstituted with 2 ml of water gives a concentration of 5 mg/ml. To draw 2 mg, you need 0.4 ml — i.e. 40 units on the syringe.

Which syringe size should you choose ?

The rule is simple: always take the smallest syringe that can hold your volume. A 0.3 ml syringe (30 units) has its graduations more spaced out than a 1 ml syringe for the same real volume — making it easier to read precisely for small volumes. A 1 ml syringe becomes necessary as soon as the calculated volume exceeds 0.5 ml.

Why does the water volume change the result ?

The more bacteriostatic water you add, the more diluted the solution — so the larger the volume needed for the same dose. Conversely, less water gives a more concentrated solution and a smaller volume to draw. The choice of water volume is a matter of comfort reading the syringe, not a matter of dose.