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    Metabolic & Weight LossPhase III

    Retatrutide Dosage Guide: Protocols, Calculator & Safety

    Everything you need to know about Retatrutide dosing — protocols, safety, and where to buy.

    Dose Range

    1,000–12,000 mcg (1–12 mg) per week

    Frequency

    Once weekly subcutaneous injection

    Cycle Length

    Ongoing; dose escalation over 24+ weeks

    Half-Life

    ~6 days

    Administration Routes

    Subcutaneous

    Quick Reconstitution Calculator

    Calculate syringe units instantly

    Syringe Draw

    10.0 units

    2500 mcg/ml · 0.100 ml draw

    Full Tool

    Dosing Protocols

    Beginner
    1 mg subcutaneous once weekly for 4 weeks (starting dose per trial protocol).
    Standard
    Escalate: 1mg x2wk → 2mg x2wk → 4mg x4wk → 8mg x4wk.
    Advanced
    Full escalation to 12 mg weekly over 24 weeks per Phase II protocol.

    Weight-Based Dosing

    Not weight-based. Fixed dose escalation per clinical trial protocols.

    Commonly Stacked With

    Not yet studied in combination protocols. Given glucagon agonism, caution with compounds affecting blood glucose. Research community use is currently experimental.

    Side Effects & Safety

    Similar GI side effects to semaglutide: nausea, vomiting, diarrhea, constipation, decreased appetite. Additional: increased heart rate, injection site reactions, fatigue. Thyroid concerns (preclinical).

    Contraindications

    Personal or family history of MTC. MEN 2. Pancreatitis history. Severe GI disease. Pregnancy or breastfeeding. Type 1 diabetes.

    Check interactions with the Interaction Checker →

    Additional Notes

    NOT YET FDA-APPROVED — currently in Phase III trials (expected 2025–2026). Phase II data showed up to 24.2% body weight loss at 48 weeks — the highest ever recorded. The glucagon component adds thermogenesis but may require monitoring of blood glucose.

    Where to Buy Retatrutide

    Compare 8 listings across 4 vendors — from $65.00

    Frequently Asked Questions

    What is the recommended Retatrutide dosage?

    The typical dose range for Retatrutide is 1,000–12,000 mcg (1–12 mg) per week. It is usually administered Once weekly subcutaneous injection. Always start with the lowest effective dose.

    How often should I take Retatrutide?

    Once weekly subcutaneous injection

    Does Retatrutide need to be cycled?

    Yes, typical cycle length is Ongoing; dose escalation over 24+ weeks.

    What are Retatrutide side effects?

    Similar GI side effects to semaglutide: nausea, vomiting, diarrhea, constipation, decreased appetite. Additional: increased heart rate, injection site reactions, fatigue. Thyroid concerns (preclinical).

    Where can I buy Retatrutide?

    Compare 8 listings from 4 vendors on our price comparison page — starting from $65.00.

    Retatrutide Full Profile

    Research data, mechanisms, and pricing

    Interaction Checker

    Check drug & compound interactions

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