The reconstitution formula converts the dry powder in your vial into a concentration you can measure on a syringe. Start with the vial's strength in milligrams and multiply by 1,000 to get the total micrograms of peptide inside. Divide that by the number of milliliters of bacteriostatic water you added, and you have the concentration in micrograms per milliliter. From there, divide your target dose in micrograms by that concentration to get the volume in milliliters, and on a U-100 insulin syringe multiply that volume by 100 to read it as unit marks. The amount of water you add does not change how much peptide is in the vial, only how concentrated each draw is. More water means a larger, easier-to-measure draw for the same dose; less water means a smaller one. Writing the four numbers down in order prevents almost every beginner mistake.
Formula in one line
Units = dose mcg / ((vial mg x 1,000) / BAC water mL) x 100.
What each input means
- Vial mg: total dry peptide powder in the vial.
- BAC water mL: liquid added to dissolve the powder.
- Dose mcg: target amount for one dose.
- Units: the mark on a 1 mL U-100 insulin syringe.
When the answer looks wrong
If the result is under 2 units, the draw is hard to read. If it is over 100 units, one 1 mL insulin syringe does not hold the whole dose. Recheck mg vs mcg first.
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Last updated 2026-08-07.