Retatrutide Reconstitution Calculator
Enter a retatrutide vial size, the bacteriostatic water added, and an example dose figure to see how the reconstitution arithmetic works — concentration, draw volume, and insulin-syringe units, live on the syringe below. Retatrutide is an investigational compound, so this page is measurement math only. It’s the same arithmetic built into the PeptideWiz app.
Investigational compound — no approved dosing. Retatrutide is an investigational medication still in clinical trials. It has no FDA-approved dosing, and this page performs measurement arithmetic only — it does not suggest that anyone use retatrutide or imply that any dose is appropriate. Every dose figure on this page is an example calculation that demonstrates the arithmetic, nothing more.
Common vial sizes
An example calculation of 1 mg would measure 20.0 units on the syringe.
Not medical advice. This calculator performs arithmetic on the numbers you enter. Retatrutide is an investigational compound with no FDA-approved dosing — this tool does not recommend a dose, confirm that retatrutide or any protocol is safe or appropriate for you, or replace a licensed medical provider.
Example mixing math (arithmetic only)
The water volume you add sets the concentration — it never changes an amount of drug, only how a given milligram figure reads on the syringe. Here’s how the formula plays out for a 10 mg vial on a U-100 insulin syringe at three water volumes:
| Water added | Concentration | Example 1 mg draw |
|---|---|---|
| 1 mL | 10,000 mcg/mL | 10 units |
| 2 mL | 5,000 mcg/mL | 20 units |
| 3 mL | 3,333 mcg/mL | 30 units |
These rows are demonstrations of the formula, not suggested doses. Retatrutide has no approved dosing — the 1 mg figure is an arbitrary example used to show how concentration changes the syringe reading.
Retatrutide status (July 2026)
Retatrutide is a triple agonist of the GIP, GLP-1, and glucagon receptors, developed by Eli Lilly and currently in phase-3 clinical trials for obesity. It is not FDA approved, and no FDA-approved dosing exists. Any use outside a clinical trial is unapproved, and dosing decisions belong to a licensed medical provider.
How to reconstitute a retatrutide vial
- Gather supplies. The lyophilized retatrutide vial, bacteriostatic water, a sterile mixing syringe, alcohol wipes, and your insulin syringes.
- Sanitize. Wash your hands and wipe both vial stoppers with a fresh alcohol wipe.
- Draw the water. Pull your chosen volume (for example 2 mL) into the mixing syringe — that volume sets the concentration, so enter the same number in the calculator above.
- Add it slowly. Let the water run gently down the inside wall of the vial. Don’t jet it straight onto the powder.
- Swirl, don’t shake. Gently swirl until the solution is completely clear — shaking can degrade peptides.
- Label and refrigerate. Write the date and concentration on the vial, store it cold, and track the reconstitution date and remaining volume in the PeptideWiz app.
Full walkthrough: How to reconstitute peptides, step by step →
How the calculation works
vial (mcg) ÷ water (mL)
How much retatrutide is in every millilitre after reconstitution.
dose (mcg) ÷ concentration
The millilitres that contain exactly that milligram figure.
mL × 100
A U-100 insulin syringe holds 100 units per millilitre.
Worked example (arithmetic only): a 10 mg vial (10,000 mcg) with 2 mL of water gives 5,000 mcg/mL. A 1 mg (1,000 mcg) example is 1,000 ÷ 5,000 = 0.2 mL, and 0.2 × 100 = 20 units — with 10 such examples in the vial. This demonstrates the formula, not a dose anyone should use.
Frequently asked questions
Is retatrutide FDA approved?
No. Retatrutide is an investigational compound in phase-3 clinical trials. It is not FDA approved for any use, and no FDA-approved dosing exists. This page performs measurement arithmetic only — it does not suggest that anyone use retatrutide or imply that any dose is appropriate.
How much bacteriostatic water should I add to a retatrutide vial?
The water volume only sets the concentration — it never changes an amount of drug, only how a milligram figure reads on the syringe. As example math only: 2 mL in a 10 mg vial gives 5,000 mcg/mL, so a 1 mg example calculation works out to a 20-unit reading. No volume is “correct” — and because retatrutide has no approved dosing, no figure on this page is a recommendation.
How do I convert a retatrutide dose to syringe units?
The arithmetic is three steps: concentration = vial (mcg) ÷ water (mL); volume = dose (mcg) ÷ concentration; units = mL × 100 on a U-100 insulin syringe. Example: a 10 mg vial with 2 mL of water is 5,000 mcg/mL, so a 1 mg (1,000 mcg) example is 0.2 mL = 20 units. This demonstrates the formula only — retatrutide has no approved dosing.
Is this calculator medical advice?
No. It is an educational arithmetic tool. It does not recommend a dose, verify that retatrutide or any protocol is appropriate for you, or replace guidance from a licensed medical provider.
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