Peptide Reconstitution Calculator
Calculate exactly how many units to draw on your insulin syringe. Select a peptide preset or enter custom values.
1 mg = 1,000 mcg. Enter the dose your provider prescribed.
Enter your values to calculate
Select a preset or enter custom values on the left
How peptide reconstitution works
Most peptides arrive as a lyophilized (freeze-dried) powder in a sealed vial. Before you can inject, you need to reconstitute the powder by adding bacteriostatic water. The amount of water you add determines the concentration, which determines how many units you draw for each dose.
The formula
Concentration = Vial Amount (mg) ÷ Water Added (mL)
Units to Draw = Desired Dose (mcg) ÷ (Concentration × 10)
Important notes
- Syringe “units” are not IU. On insulin syringes, 100 units = 1 mL. These are volumetric markings, not International Units.
- Use bacteriostatic water, not sterile water. Bacteriostatic water contains a preservative (0.9% benzyl alcohol) that allows multi-use over 28 days. Sterile water is single-use only.
- Never shake the vial. Peptides can denature if shaken. Let water run down the glass wall, then gently swirl.
- Store reconstituted peptides in the fridge. Most reconstituted peptides are stable for up to 28 days at 2-8°C.
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