Retatrutide 5 mg reconstituted with 2.5 mL
Concentration
2mg/mL
- Per insulin unit
- 20 mcg
- Solution in vial
- 250 u
- 2 mg draw
- 100 u
Math utility only — not medical advice. Not a recommended dose.
Units per dose at 2 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 | 0.5 mL | 50 u | U-50 | 5 |
| 2 mg | 1 mL | 100 u | U-100 | 2 |
| 4 mg | 2 mL | 200 u | split draw | 1 |
Amber rows exceed 100 units — more than one full U-100 barrel. That dose needs a larger draw or a stronger mix (less water).
How this is calculated
1 · Concentration
5 mg ÷ 2.5 mL = 2 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 2 mg dose
2 mg ÷ 2 mg/mL = 1 mL
3 · Insulin units
1 mL × 100 = 100 units
Every unit on the barrel carries 20 mcg at this concentration, so misreading by one unit is a 20 mcg error.
See it on a real syringe
The interactive calculator draws this 2 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 5 mg Retatrutide vial?
- Adding 2.5 mL of bacteriostatic water to a 5 mg Retatrutide vial yields 2 mg/mL — 20 mcg in every insulin unit. The reconstituted vial holds 250 units of solution in total.
- How many units is a 2 mg dose of Retatrutide at 5 mg in 2.5 mL?
- 2 mg is 1 mL of this mix, which is 100 units on a U-100 insulin syringe (a U-100 barrel is enough).
- How many 2 mg doses does a 5 mg vial give?
- A 5 mg vial contains 2 full 2 mg doses. Using more or less bacteriostatic water changes the units you draw, never the number of doses in the vial.