Draw with
confidence.
A precise reconstitution and dosing calculator. Enter your vial, your diluent, and your desired dose — read the exact draw on a U-100 insulin syringe.
Your Vial
Bacteriostatic water
- 1 mL
- 100units
- 0.5 mL
- 50units
- 1 mg
- 1000mcg
How it works.
Reconstitute
Add bacteriostatic water to the lyophilized peptide. The volume you add determines your concentration.
Find concentration
Concentration = peptide strength ÷ water added. This tells you how many mg live in each mL.
Draw your dose
Injection volume = desired dose ÷ concentration. On a U-100 syringe, every 0.01 mL is one unit.
How much bacteriostatic water to add.
Reconstitution is one division: the vial strength divided by the volume of bacteriostatic water you add gives the concentration in mg per mL. The water volume does not change how much peptide is in the vial — it only changes how many units you draw for a given dose. Larger volumes make small doses easier to measure accurately.
| Bacteriostatic water | Concentration | 1 mg dose | 500 mcg dose |
|---|---|---|---|
| 1 mL | 10 mg/mL | 10 units | 5 units |
| 2 mL | 5 mg/mL | 20 units | 10 units |
| 3 mL | 3.33 mg/mL | 30 units | 15 units |
| 5 mL | 2 mg/mL | 50 units | 25 units |
| Bacteriostatic water | Concentration | 1 mg dose | 2 mg dose |
|---|---|---|---|
| 1 mL | 30 mg/mL | 3.3 units | 6.7 units |
| 2 mL | 15 mg/mL | 6.7 units | 13.3 units |
| 3 mL | 10 mg/mL | 10 units | 20 units |
| 5 mL | 6 mg/mL | 16.7 units | 33.3 units |
Units are read on a U-100 insulin syringe, where 100 units equals 1 mL. Use the calculator above for strengths, doses, or water volumes not listed here.
How to reconstitute a peptide vial, step by step
- 1Let the lyophilized vial and the bacteriostatic water reach room temperature before opening anything.
- 2Wipe both rubber stoppers with an alcohol swab and let them dry.
- 3Draw your chosen volume of bacteriostatic water into a syringe — this is the number you decided in the table above.
- 4Angle the needle so the water runs down the inside glass wall of the vial. Never squirt it directly onto the powder.
- 5Swirl gently until the solution is clear. Do not shake: agitation can damage the peptide.
- 6Label the vial with the concentration and the date you mixed it.
- 7Store the reconstituted vial at 2–8°C and draw each dose with a fresh sterile syringe.
- How to mix RetatrutideThe full mixing walkthrough with the exact volumes we ship.
- Bacteriostatic water guideWhat it is, why it is not sterile water, and how much you need.
- How long does bacteriostatic water last?Shelf life after the first puncture.
- Peptide storage guideStoring vials before and after reconstitution in Philippine heat.
- Insulin syringe guideReading U-100 units and choosing the right needle.
This calculator is provided for educational and research reference purposes only. Always verify calculations independently before use. Origen is not responsible for dosing errors.