Retatrutide 30 mg reconstituted with 2.5 mL
Concentration
12mg/mL
- Per insulin unit
- 120 mcg
- Solution in vial
- 250 u
- 8 mg draw
- 66.7 u
Math utility only — not medical advice. Not a recommended dose.
Units per dose at 12 mg/mL
Insulin syringes are graduated in hundredths of a millilitre, so units = mL × 100 on a U-100, U-50 or U-30 barrel alike.
| Dose | Volume | U-100 units | Fits | Doses per vial |
|---|---|---|---|---|
| 1 mg | 0.083 mL | 8.3 u | U-30 | 30 |
| 2 mg | 0.167 mL | 16.7 u | U-30 | 15 |
| 4 mg | 0.333 mL | 33.3 u | U-50 | 7 |
| 6 mg | 0.5 mL | 50 u | U-50 | 5 |
| 8 mg | 0.667 mL | 66.7 u | U-100 | 3 |
How this is calculated
1 · Concentration
30 mg ÷ 2.5 mL = 12 mg/mL
The peptide mass never changes — bacteriostatic water only sets how concentrated the solution is, and therefore how far the plunger travels.
2 · Volume for a 8 mg dose
8 mg ÷ 12 mg/mL = 0.667 mL
3 · Insulin units
0.667 mL × 100 = 66.7 units
Every unit on the barrel carries 120 mcg at this concentration, so misreading by one unit is a 120 mcg error.
See it on a real syringe
The interactive calculator draws this 12 mg/mL mix on a scaled U-100 barrel, shows when a draw lands exactly on a printed tick, and works backwards from a target dose to the water volume that makes it land cleanly.
Open the interactive calculator →Common questions
- How much bacteriostatic water for a 30 mg Retatrutide vial?
- Adding 2.5 mL of bacteriostatic water to a 30 mg Retatrutide vial yields 12 mg/mL — 120 mcg in every insulin unit. The reconstituted vial holds 250 units of solution in total.
- How many units is a 8 mg dose of Retatrutide at 30 mg in 2.5 mL?
- 8 mg is 0.667 mL of this mix, which is 66.7 units on a U-100 insulin syringe (a U-100 barrel is enough).
- How many 8 mg doses does a 30 mg vial give?
- A 30 mg vial contains 3 full 8 mg doses. Using more or less bacteriostatic water changes the units you draw, never the number of doses in the vial.