Reconstitution and dosing math for lyophilized peptides drawn on a U-100 insulin syringe. Enter what is in the vial, how much bacteriostatic water you add, and the dose you want. The syringe shows the rest.
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For a blend, enter the total peptide in the vial.
Read the number at the plunger tip. On a U-100 syringe, 100 units is 1 mL.
More water means more units per dose and easier reading. Less water means fewer units and a smaller injection volume.
| Water | Concentration | Per unit | This dose | Note |
|---|
Once a vial is mixed, every unit on a U-100 syringe holds the same amount of peptide. A 5 mg vial with 2 mL of water gives 25 mcg per unit, so 10 units is 250 mcg and 20 units is 500 mcg. Write the per-unit figure on the vial label.
Under 5 units a half-unit reading error is a large share of the dose. Over 50 units the injection volume climbs and you may outgrow a 0.3 mL or 0.5 mL syringe. If the draw lands outside that range, change the water volume rather than the dose.
The powder adds no meaningful volume, so concentration is simply peptide divided by water. Bacteriostatic water is labeled for use within 28 days of the first puncture, and mixed vials are kept refrigerated at 2 to 8 °C. Follow the storage guidance for the specific peptide.
This calculator does arithmetic only. It does not recommend a peptide, a dose, or a schedule, and nothing on this page is medical advice. Compounds referenced on peptideinfo.org are discussed for research and educational purposes. Work with a licensed clinician for anything involving your health.