Retatrutide reconstitution calculator
Opens on a 10 mg vial, 0.5 mL of bacteriostatic water and a 2 mg dose, amounts recorded for Retatrutide in the compound library. Change any field and the draw updates.
Also known as GIP/GLP-1/glucagon triple agonist, LY3437943.
Original calculator
The classic all-in-one form
Every input on one card, the way the original site worked.
Typical vial strength and dose filled in; recorded examples appear as one-tap presets.
- Draw 10 units for 2 mg doses of Retatrutide.
- Concentration 20 mg/mL (10 mg in 0.5 mL). Each vial holds 5 doses of 0.1 mL.
For research and educational use. This calculator does not provide medical advice.
How the numbers work for Retatrutide
A 10 mg vial of Retatrutide with 0.5 mL of bacteriostatic water is 10 / 0.5 = 20 mg/mL. A 2 mg dose is 2 / 20 = 0.1 mL, which is 10 units on a U-100 syringe, or the same number of clicks on a pen. With 1 mL of water instead, the concentration is 10 mg/mL and the same dose is 20 units. At that dose the vial holds 5 doses.
The formulas are the same for every compound: concentration is the vial amount divided by the water, the draw is the dose divided by the concentration, and a U-100 unit is 0.01 mL. They are written out on the methodology page.
Retatrutide units at a glance
Syringe units for the amounts recorded for Retatrutide, from a 10 mg vial, across the water volumes people most often use. These are recorded examples used for the arithmetic, not recommendations; a draw under 6 units is hard to measure repeatably and more water fixes that.
| Dose | 1 mL water10 mg/mL | 2 mL water5 mg/mL | 3 mL water3.33 mg/mL |
|---|---|---|---|
| 2 mg | 20 units0.2 mL | 40 units0.4 mL | 60 units0.6 mL |
| 4 mg | 40 units0.4 mL | 80 units0.8 mL | 120 unitsover a 1 mL barrel |
| 6 mg | 60 units0.6 mL | 120 unitsover a 1 mL barrel | 180 unitsover a 1 mL barrel |
Where the amounts come from
The doses above are recorded amounts from the Retatrutide entry in the compound library, which lists the sources behind them, labels each as clinical, preclinical or community-reported, and states what the evidence can and cannot support. The vial strength is the one most often listed by suppliers. Nothing on this page is medical advice.
Common questions about Retatrutide
- Is Retatrutide an FDA-approved medicine?
- Retatrutide is an investigational Lilly compound in phase 3 trials with no approval anywhere; Lilly has said it plans to file with the FDA in 2027. FDA states that retatrutide cannot be used in compounding under federal law and has not been found safe and effective for any condition.
- How much bacteriostatic water do I add to a 10 mg vial of Retatrutide?
- There is no single right amount: the water sets the concentration and the size of the draw, not the dose. This page opens on 0.5 mL, which makes 20 mg/mL and puts a 2 mg dose at 10 units on a U-100 syringe. With 1 mL the same dose is 20 units; with 3 mL it is 60 units. More water gives a larger, easier-to-read draw, as long as the vial can hold it.
- How many units is 2 mg of Retatrutide?
- At 20 mg/mL (10 mg in 0.5 mL of water), 2 mg is 0.1 mL, which is 10 units on a U-100 insulin syringe or 10 clicks on a peptide pen. At any other concentration the number changes; the units table on this page gives the other common water volumes.
- How many doses are in a 10 mg vial of Retatrutide?
- At 2 mg per dose, a 10 mg vial holds 5 doses. The water volume changes the size of each draw, not the number of doses in the vial.
- Where do the Retatrutide amounts on this page come from?
- They are amounts recorded for Retatrutide in the compound library (https://peptidescalculator.com/compound-library/retatrutide), which lists the sources behind them and labels each as clinical, preclinical or community-reported. They are shown for the arithmetic, not as recommendations, and the vial strength is the one suppliers list most often. Nothing on this page is medical advice.