Quick answer: To convert a Retatrutide dose to units, divide your vial size (mg) by the bacteriostatic water (mL) to get the concentration, then units = (dose ÷ concentration) × 100. A 2mg dose from a 20mg vial in 3mL is 30 units on a U-100 syringe.
Retatrutide dosing in units, explained
When you reconstitute a Retatrutide vial, your dose in milligrams (mg) has to be converted into units on a U-100 insulin syringe before you can draw it. There is no single conversion: the same 2 mg dose is a different number of units depending on how much bacteriostatic water you added, because that sets the concentration. The calculator above does this for your exact vial; the reference table below covers the most common setups.
This is also why a generic chart can mislead you: a unit count only means something once it is tied to your concentration. Always confirm the number against your own vial before drawing.
Retatrutide dose-to-units reference (20 mg vial)
| Dose | 20.0 mg/mL (20mg + 1mL) |
10.0 mg/mL (20mg + 2mL) |
|---|---|---|
| 0.5 mg | 2.5 units (0.025 mL) | 5.0 units (0.05 mL) |
| 1 mg | 5.0 units (0.05 mL) | 10.0 units (0.1 mL) |
| 2 mg | 10.0 units (0.1 mL) | 20.0 units (0.2 mL) |
| 4 mg | 20.0 units (0.2 mL) | 40.0 units (0.4 mL) |
| 6 mg | 30.0 units (0.3 mL) | 60.0 units (0.6 mL) |
| 8 mg | 40.0 units (0.4 mL) | 80.0 units (0.8 mL) |
| 12 mg | 60.0 units (0.6 mL) | 120.0 units (1.2 mL) |
Any result over 100 units exceeds a single U-100 syringe. Use a higher concentration (less water) or split the dose into two draws.
Worked example
Take a 20 mg vial and add 1 mL of bacteriostatic water. That gives 20.0 mg/mL. For a 2 mg dose: (2 ÷ 20.0) × 100 = 10.0 units on a U-100 syringe (0.1 mL). Draw to that mark.
Frequently asked questions
How do you convert a Retatrutide dose in mg to insulin syringe units?
Find your concentration: divide the vial size (mg) by the bacteriostatic water added (mL). Then units = (dose ÷ concentration) × 100. A 20mg vial in 2mL is 10.0 mg/mL, so a 2mg dose = 20.0 units.
How many units is my Retatrutide dose?
It depends entirely on how you reconstituted the vial. The same mg dose can be a different number of units depending on the water volume you used. Enter your exact vial size, water, and dose above for the precise answer.
What is a U-100 insulin syringe unit in mL?
On a U-100 syringe, 100 units = 1 mL. So 50 units = 0.5 mL, 20 units = 0.2 mL, and 10 units = 0.1 mL.
Safety: Retatrutide is an investigational compound and is not approved by the FDA. This tool is educational only. Always double-check your own math and follow a licensed provider's instructions before injecting.