How many units is 2 mg of retatrutide?

It depends entirely on how much water you added. In a 10 mg vial reconstituted with 2 mL, the concentration is 5 mg/mL, so 2 mg is 0.4 mL, which is 40 units on a U-100 insulin syringe. In the same vial with 1 mL of water it is 20 units, and with 3 mL it is 60 units.

How much bacteriostatic water for a 10 mg retatrutide vial?

2 mL is the most common choice. It gives 5 mg/mL, which puts typical doses between roughly 20 and 60 units, an easy part of the barrel to read.

How many doses are in a 10 mg vial?

Divide 10 by your dose in mg. At 2 mg that is 5 doses, which at once weekly is 35 days. At 4 mg it is 2 doses.

Is retatrutide approved?

No. It is investigational and not approved for human use. Material sold online is sold for research use only.

Retatrutide dosage calculator

Retatrutide vials are usually 10 mg or 20 mg. Put in your vial strength, the water you added and your dose, and this gives you the exact unit mark to draw to.

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ReviewedDose ranges and half-life figures last checked 29 August 2026.

Dose to units, at the standard setup

Dose	Draw	U-100 units	Doses per vial	Vial lasts
1 mg	0.2 mL	20 units	10	70 days
2 mg	0.4 mL	40 units	5	35 days
3 mg	0.6 mL	60 units	3	21 days
4 mg	0.8 mL	80 units	2	14 days
6 mg	1.2 mL	120 units	1	7 days
8 mg	1.6 mL	160 units	1	7 days
10 mg	2 mL	200 units	1	7 days
12 mg	2.4 mL	240 units	0	0 days

Based on a 10 mg vial reconstituted with 2 mL of bacteriostatic water, which is 5 mg/mL, drawn on a standard U-100 insulin syringe.

About the numbers above

Retatrutide is a triple agonist, acting on the GLP-1, GIP and glucagon receptors. It is an investigational compound. It has not been approved by any regulator, and material sold online is sold for laboratory research use rather than for human use.

Reported protocols generally start low and titrate every four weeks, which is why the table runs from 1 mg up to 12 mg. Where your own dose should sit is a question for a clinician, not for a calculator.

A 10 mg vial at different water volumes

If 40 units feels like an awkward draw, change the water rather than the dose.


Vial	BAC water	Concentration	Draw	U-100 units	Doses/vial
10 mg	1 mL	10 mg/mL	0.2 mL	20 units	5
10 mg	2 mL	5 mg/mL	0.4 mL	40 units	5
10 mg	3 mL	3.33 mg/mL	0.6 mL	60 units	5
20 mg	1 mL	20 mg/mL	0.1 mL	10 units	10
20 mg	2 mL	10 mg/mL	0.2 mL	20 units	10
20 mg	3 mL	6.67 mg/mL	0.3 mL	30 units	10

All rows above assume a 2 mg dose and a standard U-100 insulin syringe, where 100 units = 1 mL.

How long it stays in you

The half-life of Retatrutide is about 6 days. That is the time for the amount in your blood to halve, so after one half-life you are at 50 percent of the peak, after two you are at 25 percent, and after four you are at roughly 6 percent. This is why a weekly compound still has meaningful levels present when the next dose lands, and why levels build over the first several weeks before they settle.

Free: The Protocol Pack, 25 printable pages. Including the part no other site writes down: what to do when you have already got it wrong. Wrong water volume, shook the vial, left it out overnight, drew the wrong units. Plus dosing cards for twelve compounds, titration planners and a vial log. Get it free.

Calculators by compound

RetatrutideVial, water and weekly dose to syringe units TirzepatideThe 2.5 to 15 mg ladder, converted SemaglutideThe 0.25 to 2.4 mg ladder, converted BPC-157mcg doses from a 5 or 10 mg vial ReconstitutionHow much water to add, and why it matters Dosing chartsPrintable unit tables for every compound Titration schedulesFull ladders with units at every step Reading a syringeU-100 vs U-40, and the 2.5x error How much water?Pick a volume that lands where you can read it

Common questions

How many units is 2 mg of retatrutide?: It depends entirely on how much water you added. In a 10 mg vial reconstituted with 2 mL, the concentration is 5 mg/mL, so 2 mg is 0.4 mL, which is 40 units on a U-100 insulin syringe. In the same vial with 1 mL of water it is 20 units, and with 3 mL it is 60 units.
How much bacteriostatic water for a 10 mg retatrutide vial?: 2 mL is the most common choice. It gives 5 mg/mL, which puts typical doses between roughly 20 and 60 units, an easy part of the barrel to read.
How many doses are in a 10 mg vial?: Divide 10 by your dose in mg. At 2 mg that is 5 doses, which at once weekly is 35 days. At 4 mg it is 2 doses.
Is retatrutide approved?: No. It is investigational and not approved for human use. Material sold online is sold for research use only.

Read this before you use the numbers. This is a unit-conversion tool. It converts a vial strength and a volume of bacteriostatic water into a concentration, a draw volume and a mark on an insulin syringe. It does not tell you what to take, whether to take it, or whether a compound is safe for you. Most of the compounds listed here are sold for laboratory research use and are not approved for human use. Nothing on this site is medical advice. Dosing decisions belong with a licensed clinician who knows your history. Always confirm the strength printed on your own vial rather than trusting a preset.