Peptide Reconstitution Calculator
Enter your vial size, the bacteriostatic water you're adding, and your target dose — get the exact concentration and the number of units to draw on a U-100 insulin syringe, with a live syringe read-out. Educational math only, never medical advice.
The two things you need to reconstitute
Bacteriostatic Water
The 0.9% benzyl-alcohol water used to reconstitute lyophilized peptides. Look for sealed, in-date multi-dose vials.
U-100 Insulin Syringes
Fine-gauge 0.5 mL / 1 mL U-100 syringes marked in units — the scale this calculator reads out in.
How peptide reconstitution math works
Reconstitution is simply dissolving a freeze-dried (lyophilized) peptide in bacteriostatic water so it can be measured and drawn. The only math involved is concentration and volume:
- Concentration = peptide in the vial (mg) ÷ water added (mL). A 10 mg vial in 2 mL of water is 5 mg/mL.
- Volume to draw = your desired dose ÷ the concentration. For a 500 mcg (0.5 mg) dose at 5 mg/mL, that's 0.1 mL.
- Units = volume (mL) × 100, because a U-100 insulin syringe reads 100 units per 1 mL. So 0.1 mL = 10 units.
More water makes each dose a larger, easier-to-read volume; less water concentrates it into fewer units. The calculator above updates all of this live as you change any input.
⚕️ This calculator is an educational arithmetic tool only. It does not recommend a dose and is not medical advice. Many peptides are not approved for human use and are sold for research purposes only. Always consult a qualified healthcare professional before making any decision about your health.
New to a specific peptide? Read the evidence-based guides or compare peptides in the Finder.