Retatrutide Dosing Calculator
28.7% body weight loss in Phase 3 TRIUMPH-4 at 68 weeks (Dec 2025) -- see dosing, side effects, FDA approval timeline.
Pre-filled with the most-reported community reconstitution protocol for Retatrutide. See how 1 mL and 2 mL of bacteriostatic water change concentration and syringe-draw volume, then adjust the calculator below for your own vial.
Also available in these vial strengths
Same Retatrutide protocol, recalculated for each vial size â reconstitution volumes, concentrations, and syringe-draw units update automatically.
Quick answer · Community-reported standard
A 20 mg vial of Retatrutide reconstituted with 2 mL of bacteriostatic water yields a concentration of 10.00 mg/mL. At that concentration, a 1 mg dose of Retatrutide equals 10 units on a U-100 insulin syringe (0.100 mL). Retatrutide is typically administered once weekly via subcutaneous.
Retatrutide 20 mg reconstitution and dosage: 1 mL vs 2 mL bac water
For a 20 mg vial of Retatrutide, bacteriostatic water volume is flexible. Less water means higher concentration and smaller injection volumes; more water means lower concentration and easier dose precision. Both options below are valid for a 20 mg vial.
| BAC water added | Concentration | Volume per 1 mg dose | Draw on U-100 syringe (units) |
|---|---|---|---|
| 1 mL | 20.00 mg/mL | 0.050 mL | 5 units |
| 2 mL | 10.00 mg/mL | 0.100 mL | 10 units |
Retatrutide dosage chart: per-injection to weekly total
Common Retatrutide protocol doses centered on the 1 mg baseline (research range 1 mgâ12 mg), with weekly totals at once weekly frequency.
| Dose level | Per injection | Frequency | Weekly total |
|---|---|---|---|
| Lower | 0.5 mg | Once weekly | 0.5 mg |
| Baseline | 1 mg | Once weekly | 1 mg |
| Higher | 1.5 mg | Once weekly | 1.5 mg |
| Upper range | 2 mg | Once weekly | 2 mg |
Weekly totals assume consistent once weekly dosing. Adjust the calculator below for your specific vial size and dose.
Calculate your Retatrutide dose
Alternative Retatrutide protocols
Beyond the default above, Retatrutide is also reported in the following protocols. Use these as starting points and recalculate with the tool above.
Conservative Start Protocol
Community- Dose
- 0.5-4 mg
- Frequency
- Once weekly
- Duration
- 12-24 weeks
- Route
- Subcutaneous
Some community members start at sub-clinical doses (0.5 mg) and escalate more slowly than clinical protocols to assess individual tolerance
Moderate Dose Maintenance
Community- Dose
- 4-8 mg
- Frequency
- Once weekly
- Duration
- Ongoing
- Route
- Subcutaneous
Users report significant weight loss and appetite suppression at 4-8 mg without needing to reach 12 mg; lower doses may reduce GI and other side effects
Phase 2 Dose Escalation (Obesity Trial - NCT04881760)
Clinical- Dose
- Starting dose 0.5 mg weekly, escalated over 12-24 weeks to target doses (1 mg, 4 mg, 8 mg, or 12 mg)
- Frequency
- Once weekly subcutaneous injection
- Duration
- 48-week treatment period
Investigational protocol only; not for clinical use outside trials
Phase 2 Type 2 Diabetes Trial
Clinical- Dose
- Starting dose 0.5 mg weekly, escalated to target doses up to 12 mg
- Frequency
- Once weekly subcutaneous injection
- Duration
- 36-week treatment period
Investigational protocol in patients with type 2 diabetes; background metformin permitted
Retatrutide reconstitution & storage
Investigational formulation; details not publicly available for clinical use
Investigational product; storage per clinical trial protocol
Retatrutide dosing FAQ
How much bacteriostatic water should I add to a 20 mg vial of Retatrutide?
The community standard is 2 mL of bacteriostatic water for a 20 mg Retatrutide vial. That gives a concentration of 10.00 mg/mL, so a 1 mg dose is 10 units on a U-100 insulin syringe. Adding 1 mL instead doubles the concentration to 20.00 mg/mL and halves the draw to 5 units. Less water = smaller injection volume but harder to measure precisely.
How many syringe units is a 1 mg dose of Retatrutide?
On a standard U-100 insulin syringe, a 1 mg dose of Retatrutide is 10 units when the 20 mg vial is reconstituted with 2 mL of bacteriostatic water (10.00 mg/mL). If you use 1 mL of bac water instead, draw 5 units (20.00 mg/mL).
What is the standard Retatrutide dose?
Community-reported protocols for Retatrutide typically use 1 mgâ12 mg once weekly via Subcutaneous. 1 mg is a common starting dose. Based on Phase 2 trial schedule: 1 mg x4 weeks, 2 mg x4 weeks, 4 mg x4 weeks, escalating up to 8 or 12 mg; community users attempt to replicate clinical dosing
How long does a vial of Retatrutide last at 1 mg once weekly?
A 20 mg vial of Retatrutide contains roughly 20 doses at 1 mg per injection. At once weekly dosing, that is approximately 140 days (about 20 weeks) of supply per vial. Reconstituted Retatrutide should generally be used within 28 days when refrigerated.
Where do you inject Retatrutide?
Retatrutide is typically injected subcutaneous. Common sites reported in the literature and by users include: Subcutaneous (abdomen), Subcutaneous (thigh). Rotate sites with each injection to reduce localized irritation.
Can I use sterile water instead of bacteriostatic water for Retatrutide?
Bacteriostatic water (containing 0.9% benzyl alcohol as a preservative) is strongly preferred for multi-dose vials like Retatrutide because it inhibits microbial growth and lets a single vial be used over multiple weeks. Sterile water has no preservative and should generally be reserved for single-use preparations only.
More on Retatrutide
Retatrutide overview
Mechanism of action, primary uses, and research summary
Retatrutide dosing protocols
Full clinical and research-based dosing reference
Retatrutide community protocols
Real-world usage patterns from peptide communities
Retatrutide side effects
Reported adverse effects and safety considerations
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Medical Disclaimer
This website is for educational and informational purposes only. The information provided is not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before using any peptide or supplement.