Peptide reconstitution calculator
Not mixed your vial yet? Enter the peptide amount and your dose, and see what each amount of water gives you on the syringe. Pick one that lands on a line.
It's printed on the vial label, for example 5mg. This is the powder before any water goes in.
Where is it on the label?
The amount is the big figure on the label, in mg. Ignore the volume of water or the batch number.
Use the number and unit exactly as you were given it. Doses under 1 mg are usually written in mcg (micrograms). 1 mg is 1,000 mcg.
Any of these works. The ones marked "on a line" are easiest to read on your syringe. Pick one and write it down.
How to mix it, in 5 steps
- Wash your hands. Wipe both vial tops with an alcohol swab.
- Draw up the amount of water you chose above.
- Push the needle into the peptide vial and let the water run slowly down the inside wall, not straight onto the powder.
- Swirl gently or roll it between your palms until clear. Don't shake it.
- Write the date and the amount of water on the vial, and keep it in the fridge.
Look at the biggest number printed on the side of the syringe.
Not sure? See the three sizes
All three are U-100 insulin syringes: 100 units is 1 mL. The top mark tells you which one you have. A 1 mL syringe has a line every 2 units, so count carefully.
There is no single right amount of water. More water makes each dose a bigger, easier-to-read volume; less water keeps the volume small. Choose an amount where your dose lands on a printed line and fits your syringe, write it on the vial, and use the same number every time you calculate.
Every step is shown
Open "Show the maths" and you can check each line yourself, or show it to someone you trust.
We catch the common slips
Mixing up mg and mcg, or picking the wrong syringe, are the usual mistakes. We flag both before you draw.
Nothing to sell you
No shop, no seller links, no account. Your numbers stay on your device.
Water amounts for common vials
For a 250 mcg dose on a 1 mL (100 unit) syringe. Change the dose in the calculator above to see your own numbers.
| Vial | Water | Strength | 250 mcg is | Doses per vial |
|---|---|---|---|---|
| 5 mg | 1 mL | 5 mg/mL | 5 units (0.05 mL) | 20 |
| 5 mg | 2 mL | 2.5 mg/mL | 10 units (0.1 mL) | 20 |
| 5 mg | 2.5 mL | 2 mg/mL | 12.5 units (0.125 mL) | 20 |
| 5 mg | 3 mL | 1.67 mg/mL | 15 units (0.15 mL) | 20 |
| 10 mg | 1 mL | 10 mg/mL | 2.5 units (0.025 mL) | 40 |
| 10 mg | 2 mL | 5 mg/mL | 5 units (0.05 mL) | 40 |
| 10 mg | 2.5 mL | 4 mg/mL | 6.3 units (0.063 mL) | 40 |
| 10 mg | 3 mL | 3.33 mg/mL | 7.5 units (0.075 mL) | 40 |
| 15 mg | 1 mL | 15 mg/mL | 1.7 units (0.017 mL) | 60 |
| 15 mg | 2 mL | 7.5 mg/mL | 3.3 units (0.033 mL) | 60 |
| 15 mg | 2.5 mL | 6 mg/mL | 4.2 units (0.042 mL) | 60 |
| 15 mg | 3 mL | 5 mg/mL | 5 units (0.05 mL) | 60 |
How to mix a vial, in 5 steps
- Wash your hands. Wipe both vial tops with an alcohol swab.
- Draw up the amount of bacteriostatic water you chose.
- Push the needle into the peptide vial and let the water run slowly down the inside wall, not straight onto the powder.
- Swirl gently or roll it between your palms until clear. Don't shake it.
- Write the date and the amount of water on the vial, and keep it in the fridge.
If anything here differs from the instructions that came with your prescription, follow those and ask your pharmacist.