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 usual choice. It gives 5 mg/mL, which puts the commonly reported range of 0.5 mg to 12 mg between roughly 10 and 240 units. Aim for a draw between about 10 and 50 units, where the barrel is easiest to read, and add or remove water to get there.

How many doses are in a 10 mg vial?

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

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.

IndependentThis site does not sell peptides and is not owned by a vendor. Every other calculator on page one of Google belongs to a shop.

The maths is openThe formula is written out on this page and the code behind it is a single file with an automated test suite.

How it earnsAffiliate links on one clearly marked page, and nowhere else. Never inside the calculator.

ReviewedDose ranges and half-life figures last checked 3 September 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	needs a bigger vial	-

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, once weekly.

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 the draw feels awkward to read, change the water rather than the dose. The dose stays the same; only the mark moves.

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
15 mg	1 mL	15 mg/mL	0.133 mL	13.3 units	7
15 mg	2 mL	7.5 mg/mL	0.267 mL	26.7 units	7
15 mg	3 mL	5 mg/mL	0.4 mL	40 units	7

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.

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 usual choice. It gives 5 mg/mL, which puts the commonly reported range of 0.5 mg to 12 mg between roughly 10 and 240 units. Aim for a draw between about 10 and 50 units, where the barrel is easiest to read, and add or remove water to get there.
How many doses are in a 10 mg vial?: Divide 10 by your dose. At 2 mg that is 5 doses, which at once weekly is 35 days.
Is retatrutide approved?: No. It is investigational and not approved for human use. Material sold online is sold for research use only.

Buying Retatrutide? The where to buy page lists the vendors this site uses and what to check before ordering, and Peptide Bureau keeps the ranked vendor scorecard.

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Tools

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Reconstitution calculator How much water to add, and why it matters
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Bacteriostatic water calculator Pick a volume that lands where you can read it
How to read an insulin syringe U-100 vs U-40, and the 2.5x error
The Protocol Pack Free 25-page printable reference
Where to buy Vendor notes and what to check first
1 mg to units on an insulin syringe The conversion table for every common concentration

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.