Retatrutide peptide calculator
A 10 mg Retatrutide vial mixed with 2 ml of bacteriostatic water holds 5 mg/ml. A 2 mg dose is 0.40 ml — 40 units on a U-100 insulin syringe — and the vial holds 5 doses of that size.
Retatrutide dosage chart: units to draw
Units on a U-100 insulin syringe (100 units = 1 ml) for Retatrutide doses from 2 mg to 8 mg, by how much bacteriostatic water is in a 10 mg vial. The highlighted row is the 2 mg dose used above.
| Dose | 1 ml water 10 mg/ml | 2 ml water 5 mg/ml | 3 ml water 3.33 mg/ml | Doses per vial |
|---|---|---|---|---|
| 2 mg | 20 u 0.20 ml | 40 u 0.40 ml | 60 u 0.60 ml | 5 |
| 4 mg | 40 u 0.40 ml | 80 u 0.80 ml | 1.20 ml over 100 u | 2 |
| 8 mg | 80 u 0.80 ml | 1.60 ml over 100 u | 2.40 ml over 100 u | 1 |
A 40-unit draw fits a 0.5 ml insulin syringe (50-unit capacity) with 1-unit markings.
Unit math only, not a dosing recommendation. The dose range is what published protocols and trials describe; see the Retatrutide guide for sources.
How to reconstitute Retatrutide
- Wipe both vial stoppers with a fresh alcohol swab and let them dry.
- Draw 2 ml of bacteriostatic water into a syringe.
- Insert the needle at an angle into the Retatrutide vial and let the water run slowly down the inner wall — do not inject directly onto the powder.
- Do not shake. Gently swirl the vial until the peptide fully dissolves.
- Storage for Retatrutide: Lyophilized refrigerated. Reconstituted: refrigerated 2–8 °C, use within 28 days.
- For a 2 mg dose, draw to the 40-unit mark (0.40 ml) on a U-100 insulin syringe.
About Retatrutide
Retatrutide is an investigational triple agonist at GIP, GLP-1, and glucagon receptors. Phase 2 trial data reported weight loss exceeding prior GLP-1 and GLP-1/GIP agents.
Half-life: Approximately 6 days (once-weekly dosing)
Typical dose range: Titration: 2 mg → 4 mg → 8 mg → 12 mg weekly (trial protocols)
Class: Triple GIP / GLP-1 / glucagon receptor agonist
Regulatory status: Investigational. Eli Lilly Phase 3 trials ongoing as of 2026. Not FDA approved.
Read the full Retatrutide guide → — mechanism, side effects, storage, regulatory status and citations. Or browse the whole peptide glossary.
Other tools for Retatrutide
Calculators for related peptides: Tirzepatide, Liraglutide, Semaglutide, Survodutide, AOD-9604.
Need a different unit or a different question? The peptide dose converter moves a dose between mcg, mg and IU, and the Retatrutide half-life chart shows how concentration accumulates across a dosing cadence. Loading Retatrutide into a reusable 3 ml pen instead of drawing it with a syringe? The peptide pen calculator turns the same vial into mcg per click and clicks to dial. All of them are listed on the free peptide tools page.
Retatrutide calculator FAQ
Is this a Retatrutide peptide calculator or a reconstitution calculator?
Both. This Retatrutide calculator converts vial strength, bacteriostatic-water volume, and target dose into milliliters and insulin-syringe units. It does not recommend a medical dose.
How much bacteriostatic water for a 10 mg Retatrutide vial?
This page is pre-filled with 2 ml of bacteriostatic water for a 10 mg Retatrutide vial because that is a common research ratio. You can adjust the water amount in the full calculator.
How many units is a 2 mg Retatrutide dose?
40 units on a U-100 insulin syringe, when a 10 mg vial is mixed with 2 ml of bacteriostatic water (5 mg/ml). That is 0.40 ml. With a different amount of water the unit count changes — the dose chart on this page lists 1 ml, 2 ml, 3 ml mixes.
How many doses are in a 10 mg Retatrutide vial?
5 doses of 2 mg. The number of doses depends only on vial strength and dose size — adding more or less water changes the volume of each draw, not how many draws the vial holds.
Does this Retatrutide dosage calculator give medical advice?
No. It only performs unit math. Dosing, titration, and whether Retatrutide is appropriate are clinical decisions that should be made with a licensed healthcare professional.
Skip the math — let the app handle it
Peptide Protocol remembers your Retatrutide vial, shows the units for every dose, tracks what is left, and rotates injection sites for you.
Get the iPhone app →Educational use only. Peptide Protocol is an informational tool. Nothing on this page constitutes medical advice. Many peptides are prescription-only or restricted in your jurisdiction. Always consult a licensed healthcare professional before injecting any compound.