Protocol
Retatrutide (20 mg Vial)
Complete dosage protocol and reconstitution guide for Retatrutide (20 mg Vial).
Calculator preset
Run the vial math before tracking.
At 10 mg/mL, 1 unit = 0.01 mL = 0.1 mg on a U-100 insulin syringe.
01 · At a glance
Quickstart Highlights
Retatrutide is a novel triple agonist targeting GLP-1, GIP, and glucagon receptors [1] , studied for substantial weight loss and metabolic improvement in obesity and type 2 diabetes [2] [3] . With an extended half-life of approximately 6 days, this peptide enables convenient once-weekly subcutaneous dosing with a gradual titration protocol to optimize tolerability [1] [4] .
02 · Dosing & reconstitution
Dosing & Reconstitution Guide
A practical calculator-ready setup based on the imported protocol reference. Use these values as a math starting point, then verify every entry against your own vial, diluent, and professional guidance.
Standard / Gradual Titration Approach (2 mL = 10.0 mg/mL)
2–12 mg once weekly (gradual escalation over 12+ weeks).
Reconstitution Steps
- Draw 2.0 mL bacteriostatic water with a sterile syringe.
- Inject slowly down the vial wall; avoid foaming.
- Gently swirl/roll until dissolved (do not shake vigorously).
- Label with reconstitution date and refrigerate at 2–8 °C (35.6–46.4 °F) , protected from light.
- Note: The 20 mg vial size is highly efficient for weekly protocols.
03 · What you'll need
Supplies Needed
Keep this as a planning checklist. TNHL does not sell or verify supplies on this page, and no supplier quality claims are made here.
- 12 weeks (2→4→8 mg titration): 3 vials
- 24 weeks (up to 12 mg): 10 vials
- 48 weeks (maintenance at 12 mg): 25 vials
- 12 weeks: 12 syringes
- 24 weeks: 24 syringes
- 48 weeks: 48 syringes
- 12 weeks (3 vials): 6 mL → 1 × 10 mL bottle
- 24 weeks (10 vials): 20 mL → 2 × 10 mL bottles
- 48 weeks (25 vials): 50 mL → 5 × 10 mL bottles
- Per week: 2 swabs
- 12 weeks: 24 swabs → 1 × 100-count box
- 24 weeks: 48 swabs → 1 × 100-count box
- 48 weeks: 96 swabs → 1 × 100-count box
Protocol Overview
- Goal: Achieve substantial weight loss (up to 24% of body weight) and improved metabolic parameters through triple receptor agonism [2] [5] .
- Schedule: Weekly subcutaneous injections for 12+ weeks with gradual dose escalation.
- Dose Range: 2–12 mg once weekly; clinical trials tested up to 12 mg as the maximum maintenance dose [1] [3] .
- Reconstitution: 2.0 mL per 20 mg vial (10.0 mg/mL) provides optimal concentration for weekly dosing with minimal waste.
- Storage: Lyophilized frozen at −20 °C (−4 °F); reconstituted solution refrigerated at 2–8 °C (35.6–46.4 °F); use within 2–4 weeks.
Dosing Protocol
- Evidence-based weekly titration approach from clinical trials.
- Start: 2 mg once weekly for first 4 weeks to establish tolerability [1] [4] .
- Escalation: Increase to 4 mg weekly (Weeks 5–8), then 8 mg weekly (Weeks 9–12) [1] .
- Maintenance: 12 mg weekly (Week 13 onward) for maximum efficacy; 8 mg weekly is an alternative maintenance dose [2] .
- Frequency: Once per week (subcutaneous); consistent day/time recommended.
- Cycle Length: Minimum 12 weeks for titration; clinical trials extended to 48 weeks showing sustained weight loss [2] .
- Timing: Any consistent weekly schedule; rotate injection sites each week.
Storage Instructions
- Proper storage maintains peptide stability and potency.
- Lyophilized: Store at −20 °C (−4 °F) or colder for long-term preservation; protect from moisture and light [11] [12] .
- Reconstituted: Refrigerate at 2–8 °C (35.6–46.4 °F) immediately after mixing; use within 2–4 weeks for maximum potency [11] .
- Handling: Allow frozen vials to reach room temperature before opening to minimize condensation; never expose reconstituted solution to heat or direct sunlight.
- Aliquoting: For extended storage beyond 4 weeks, consider freezing unused aliquots; avoid repeated freeze-thaw cycles [12] .
04 · Good to know
Important Notes
- This Retatrutide page is for educational research organization only.
- Confirm route, dose, contraindications, monitoring, storage, and cycle decisions with qualified professional guidance.
- Use sterile technique, rotate sites when applicable, and log missed doses, reactions, and inventory changes.
05 · How it works
How This Works
Retatrutide is a novel triple agonist targeting GLP-1, GIP, and glucagon receptors [1] , studied for substantial weight loss and metabolic improvement in obesity and type 2 diabetes [2] [3] .
With an extended half-life of approximately 6 days, this peptide enables convenient once-weekly subcutaneous dosing with a gradual titration protocol to optimize tolerability [1] [4] .
Reconstitute: Add 2.0 mL bacteriostatic water → 10.0 mg/mL concentration for optimal weekly doses.
The library page pairs that educational context with calculator-ready vial math, so users can understand the protocol structure and then track their own entered values in one place.
06 · Daily habits
Lifestyle Factors
- Keep meals, training, sleep, and recovery notes in the journal so trends are easier to review.
- Track body metrics only if they are relevant to the user's goal and approved data sources.
- Use consistent timing and logging habits so adherence data is meaningful.
07 · What to expect
Potential Benefits & Side Effects
- Retatrutide observations should be recorded conservatively: expected research endpoints, tolerability notes, injection-site reactions when applicable, sleep, appetite, energy, mood, and any adverse or unusual response.
- This section is not a claim of therapeutic benefit.
08 · Technique
Injection Technique
- Wash hands with soap and water.
- Wipe the vial stopper and chosen site with alcohol, then let both dry.
- Confirm the vial concentration, calculator result, and intended draw amount before loading the syringe.
- Use the route and needle technique directed by a qualified professional or product instructions.
- For subcutaneous injections, rotate sites and inject slowly to limit leakage and irritation.
- Do not reuse needles or syringes.
- Dispose of sharps in a puncture-resistant container.
- Return stored items promptly to the correct temperature.
- Log dose, site, date, time, inventory change, and any observation.
09 · Evidence
References
Related pages