HomePeptide dosagesRetatrutide30 mg vial
Retatrutide 30 mg vial: mixing and syringe units
A 30 mg vial of Retatrutide mixed with 1.5 mL of bacteriostatic water is 20 mg/mL. At that strength 2 mg is 10 units on a U-100 syringe and 12 mg is 60 units. The doses on this page are the doses given in human trials, because there is no approved label.
30 mg vial
Water 1.5 mL
Concentration 20 mg/mL
US Not approved, in trials
Canada Not authorized
Checked 10 Oct 2026Retatrutide 30 mg draw chart
Each row is one dose, the volume to draw and where that sits on a U-100 insulin syringe. The last three columns show which syringe sizes can hold it in one draw.
| Dose | Volume | Syringe units | 0.3 mL syringe | 0.5 mL syringe | 1 mL syringe |
|---|---|---|---|---|---|
| 2 mg | 0.10 mL | 10 units | Yes | Yes | Yes |
| 4 mg | 0.20 mL | 20 units | Yes | Yes | Yes |
| 8 mg | 0.40 mL | 40 units | No | Yes | Yes |
| 9 mg | 0.45 mL | 45 units | No | Yes | Yes |
| 12 mg | 0.60 mL | 60 units | No | No | Yes |
Source Weekly doses given in the Phase 2 and Phase 3 obesity trials (NEJM 2023 and 2026). Vial math is arithmetic.
How to mix a 30 mg Retatrutide vial
- Wash your hands. Wipe the stopper of the Retatrutide vial and the water vial with an alcohol swab.
- Draw 1.5 mL of bacteriostatic water into a syringe.
- Push the needle through the stopper of the peptide vial and let the water run slowly down the glass, not straight onto the powder.
- Swirl the vial gently until the powder is gone. Do not shake it.
- Write the date and 20 mg/mL on the vial, then put it in the fridge.
If you add a different amount of water
More water makes each dose a bigger, easier draw. Less water makes it smaller. The milligrams in the vial do not change.
| Water added | Concentration | 2 mg | 4 mg | 8 mg | 9 mg | 12 mg |
|---|---|---|---|---|---|---|
| 1 mL | 30 mg/mL | 6.7 units | 13.3 units | 26.7 units | 30 units | 40 units |
| 1.5 mL | 20 mg/mL | 10 units | 20 units | 40 units | 45 units | 60 units |
| 2 mL | 15 mg/mL | 13.3 units | 26.7 units | 53.3 units | 60 units | 80 units |
| 3 mL | 10 mg/mL | 20 units | 40 units | 80 units | 90 units | 120 units |
The marked row is the amount used in the chart above. Red cells are draws under 5 units, which are hard to read, or over 100 units, which one 1 mL syringe cannot hold.
How many doses are in the vial
| Dose | Whole doses in a 30 mg vial | At once weekly |
|---|---|---|
| 2 mg | 15 doses | 15 weeks |
| 4 mg | 7 doses | 7 weeks |
| 8 mg | 3 doses | 3 weeks |
| 9 mg | 3 doses | 3 weeks |
| 12 mg | 2 doses | 2 weeks |
Retatrutide 30 mg vial questions
How many units is 2 mg of Retatrutide from a 30 mg vial?
With 1.5 mL of bacteriostatic water the vial is 20 mg/mL. 2 mg is 0.10 mL, which is 10 units on a U-100 syringe.
How many units is 4 mg of Retatrutide from a 30 mg vial?
With 1.5 mL of bacteriostatic water the vial is 20 mg/mL. 4 mg is 0.20 mL, which is 20 units on a U-100 syringe.
How many units is 8 mg of Retatrutide from a 30 mg vial?
With 1.5 mL of bacteriostatic water the vial is 20 mg/mL. 8 mg is 0.40 mL, which is 40 units on a U-100 syringe.
How much bacteriostatic water goes in a 30 mg Retatrutide vial?
1.5 mL is the amount used on this page. It gives 20 mg/mL and puts the doses at 10, 20, 40, 45, 60 units. Any amount works as long as the math is redone for it.
What if I added 1 mL instead of 1.5 mL?
The vial would be 30 mg/mL instead of 20 mg/mL, so 2 mg would be 6.7 units instead of 10. The dose in the syringe is the same; only the volume changes.
How many doses are in a 30 mg Retatrutide vial?
Whole doses in one vial: 15 at 2 mg, 7 at 4 mg, 3 at 8 mg, 3 at 9 mg, 2 at 12 mg.
More on Retatrutide
This page is only the math for one vial size. Where the doses come from, what the studies found, the side effects and the sources are on the main page.
Retatrutide dosageRetatrutide 10 mg vialWhat Retatrutide isHow to mix a vialHow to read a syringe
DosageFacts is an information site. It is not medical advice. Talk to a licensed professional before using any medication.