Retatrutide 20 mg reconstituted with 3 mL
Concentration
6.67mg/mL
- Per insulin unit
- 66.7 mcg
- Solution in vial
- 300 u
- 6 mg draw
- 90 u
Math utility only — not medical advice. Not a recommended dose.
Units per dose at 6.67 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 | 0.15 mL | 15 u | U-30 | 20 |
| 2 mg | 0.3 mL | 30 u | U-30 | 10 |
| 4 mg | 0.6 mL | 60 u | U-100 | 5 |
| 6 mg | 0.9 mL | 90 u | U-100 | 3 |
| 8 mg | 1.2 mL | 120 u | split draw | 2 |
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
20 mg ÷ 3 mL = 6.67 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 6 mg dose
6 mg ÷ 6.67 mg/mL = 0.9 mL
3 · Insulin units
0.9 mL × 100 = 90 units
Every unit on the barrel carries 66.7 mcg at this concentration, so misreading by one unit is a 66.7 mcg error.
See it on a real syringe
The interactive calculator draws this 6.67 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 20 mg Retatrutide vial?
- Adding 3 mL of bacteriostatic water to a 20 mg Retatrutide vial yields 6.67 mg/mL — 66.7 mcg in every insulin unit. The reconstituted vial holds 300 units of solution in total.
- How many units is a 6 mg dose of Retatrutide at 20 mg in 3 mL?
- 6 mg is 0.9 mL of this mix, which is 90 units on a U-100 insulin syringe (a U-100 barrel is enough).
- How many 6 mg doses does a 20 mg vial give?
- A 20 mg vial contains 3 full 6 mg doses. Using more or less bacteriostatic water changes the units you draw, never the number of doses in the vial.