This Retatrutide calculator shows how many units to draw after reconstituting a Retatrutide vial. It includes common vial sizes, half-life, and storage notes.
Retatrutide at a glance
| Class | GIP, GLP-1, and glucagon receptor agonist |
| Status | Investigational (phase 3 trials), not FDA-approved |
| Typical vial sizes | 5 mg, 10 mg, 20 mg |
| Half-life | About 6 days |
| Molecular weight | 4,731.3 g/mol |
| Storage | Lyophilized: freeze at −20 °C for long-term storage or refrigerate at 2–8 °C short term. Reconstituted: refrigerate at 2–8 °C, protect from light, do not freeze. |
How to use the Retatrutide Calculator
- Enter the vial size, or tap a preset.
- Enter the bac water added, or tap a preset.
- Enter the desired dose and choose mcg or mg.
- Choose the syringe type.
- Read the result card. It updates as you type, and you can copy or share it.
About this calculator
Retatrutide is a gIP, GLP-1, and glucagon receptor agonist. Status: Investigational (phase 3 trials), not FDA-approved. The presets above reflect the vial sizes and water volumes most often used for Retatrutide.
The math is the same as the general reconstitution calculator. Only the presets and reference data change.
Frequently asked questions
What vial sizes does Retatrutide come in?
Commonly 5 mg, 10 mg, 20 mg. Always use the amount printed on your vial.
How should Retatrutide be stored?
Lyophilized: freeze at −20 °C for long-term storage or refrigerate at 2–8 °C short term. Reconstituted: refrigerate at 2–8 °C, protect from light, do not freeze.
What is the half-life of Retatrutide?
About 6 days.
Sources
- Jastreboff AM et al. Triple-hormone-receptor agonist retatrutide for obesity. N Engl J Med. 2023;389:514–526. New England Journal of Medicine.
- General Chapter <797> Pharmaceutical Compounding: Sterile Preparations. U.S. Pharmacopeia.
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Medical disclaimer. This calculator is for educational purposes only and is not medical advice. Results are mathematical estimates based on the values you enter. Many peptides listed here are not approved by the FDA for human use. Confirm every dose with a licensed healthcare provider or your approved study protocol, and follow the product label.
