Retatrutide Reconstitution Calculator
Retatrutide reconstitution calculator: pick your vial size, your dose and how many units you want to draw, and see exactly how much bacteriostatic water to add.
How the math works
Work backwards from the syringe.
- Decide how many units you want each dose to read, for example 20 units.
- 20 units on a U-100 syringe is 0.2 mL, so your dose has to fit in 0.2 mL. For a 2 mg dose that means 10 mg per mL.
- Divide the vial's milligrams by that concentration. A 10 mg vial at 10 mg per mL needs 1 mL of water.
Common mixes
| Vial | Water | Concentration | 2 mg reads as | 4 mg reads as |
|---|---|---|---|---|
| 5 mg | 1 mL | 5 mg/mL | 40 units | 80 units |
| 10 mg | 1 mL | 10 mg/mL | 20 units | 40 units |
| 10 mg | 2 mL | 5 mg/mL | 40 units | 80 units |
| 20 mg | 2 mL | 10 mg/mL | 20 units | 40 units |
| 30 mg | 3 mL | 10 mg/mL | 20 units | 40 units |
Picking a mix that suits your dose
More water makes small doses easier to measure because each dose takes up more space on the syringe. Less water keeps larger doses inside one syringe. If your dose is going to rise over the coming weeks, choose the mix that still fits the highest dose in a single draw.
Vial size and cost
Larger vials usually cost less per milligram, which matters more than the mix. When you compare retatrutide for sale, check the price per milligram and that each batch has a third-party certificate of analysis.
Frequently asked questions
How much bacteriostatic water do I add to a 10 mg vial of retatrutide?
It depends on how you want each dose to read. With 1 mL, a 10 mg vial holds 10 mg per mL, so 2 mg reads as 20 units. With 2 mL it holds 5 mg per mL, so 2 mg reads as 40 units. Neither is more correct; pick the one that makes your dose easy to measure.
Does adding more water make the dose weaker?
No. The total milligrams in the vial stay the same. More water only spreads them over more volume, so you draw more units for the same dose.
What is a good number of units to aim for?
Many people pick round numbers such as 10, 20 or 25 units per dose so the reading lands on a clear line. Very small draws, under about 5 units, are harder to measure accurately.
Can I change the water amount after mixing?
Not easily. Once water is in the vial, the concentration is set. Use the dose calculator with the water you actually added to find the right number of units.