Track Your Retatrutide Protocol
The first tracker built for the triple-agonist. Log doses, monitor weight, and track your body's response to GLP-1/GIP/glucagon activation.
Retatrutide is an investigational compound currently in Phase 3 trials. It is not FDA-approved. This page describes how Regimen supports tracking for people already on retatrutide protocols, not a recommendation to use it.
Dose with precision
Regimen handles the dose math so you don't have to, including compounded vial conversions.
Compounded dose calculator
Using compounded semaglutide or tirzepatide from a vial? Input your vial size, bacteriostatic water volume, and target dose. Regimen tells you exactly how many units to draw.
Never miss a dose. Stay on schedule.
Stay consistent with zero effort. Regimen supports weekly injections, dose-step changes, and any schedule your medication needs, with smart reminders that actually help.
Every schedule you need
Weekly · specific days · split-week · every X days · twice daily · as-needed. Injections, pills, sprays. Your routine, your way.
Dose-step management
Log every step-up in your dose schedule with the date. When something shifts a week after a step, you can see it on the timeline instead of guessing.
See what's actually working
Correlate every dose and step-up against real health data. Stop guessing what's actually moving the needle for you.
Auto-sync from Apple Health & Google Health Connect
Weight, body fat, sleep, resting heart rate, and blood pressure flow in automatically. No manual logging required.
Log the signals your labs miss
Log energy, libido, sleep, and recovery alongside your numbers. See the response labs miss between pulls.
Correlate medications with health trends
Stepped up your dose three weeks ago? See exactly how your weight, energy, and side effects responded. Every dose change is overlaid on your health charts.
Know what's in your system
See estimated concentration curves for your compounds in real time. Know if you're at peak, trough, or steady state without waiting for labs.
Pharmacokinetic modeling for 150+ compounds
Regimen uses half-life data to model absorption, peak levels, and decay for every dose you take. See how levels build up over multiple doses.
Peak, trough & steady state visibility
Understand where you are in your dosing cycle at any moment. See projected future levels based on your current schedule.
Why tracking retatrutide matters
You ARE the data
With limited real-world use, your tracked protocol is some of the most valuable retatrutide data that exists. Detailed logging matters here more than any other compound.
Triple agonist complexity
GIP + GLP-1 + glucagon means more metabolic variables. Correlating your weight, appetite, energy, and body composition against dose changes is essential.
Provider communication
Your doctor has limited retatrutide data too. Sharing your tracked dose history, weight trends, and side effect patterns makes appointments more productive.
Related Tools & Guides
What Regimen Tracks for Retatrutide
What to track on a retatrutide protocol
The compound has a long half-life (about 6 days), which means tracking weekly is enough. Log these:
- Dose for the week (mg) and which titration step you are on
- Injection day and rotation site (abdomen, thigh, upper arm)
- Body weight (weekly, same time of day, ideally morning fasted)
- Waist measurement (weekly: separates fat loss from water shifts)
- GI side effects severity (nausea, constipation, GERD on a 1-10 scale)
- Appetite suppression rating (1-10): the main mechanism, worth tracking
- Resting heart rate (some users see 5-10 bpm elevation)
- Energy and mood (quick subjective rating)
- Labs every 8-12 weeks: lipids, fasting glucose, HbA1c
Common mistakes when tracking retatrutide
- Logging weight without also logging your dose for that week. You cannot correlate response to dose without both.
- Skipping the side effect log when titrating up. The data tells you when you have gone too fast.
- Logging weight inconsistently (different time of day, different hydration state).
- Not tracking appetite suppression separately from weight. Appetite is the leading indicator. Weight is the lagging one.
- Stopping the log once you "feel dialed in." The real data is in months 4-12 when you are deciding whether to maintain, lower, or cycle off.
Frequently asked questions
What is the maximum retatrutide dose?
Phase 3 trials used 12mg per week as the maximum. Most biohacker protocols do not exceed 12mg. Side effects often become the limiting factor before reaching 12mg.
How long until I see weight loss on retatrutide?
Most users feel appetite suppression within the first injection. Visible weight loss typically begins in week 2-3 of the 2mg starting dose. Significant change usually shows by week 8 at the 4mg dose.
Should I track on the Mounjaro tracker or the retatrutide tracker?
Use the retatrutide tracker. Both are GLP-1 family compounds, but retatrutide's dosing, titration math, and side effect profile are different enough to warrant separate tracking.
Can I track multiple GLP-1 medications during a switch?
Yes. Regimen supports tracking multiple compounds in parallel, which is useful when transitioning from semaglutide or tirzepatide to retatrutide. See our switching tirzepatide to retatrutide guide. The gap week (typically 1 week) shows clearly in your timeline.
How precise do I need to be with retatrutide dosing?
Within 0.1mg is plenty. The 6-day half-life smooths out small day-to-day variation across the week.
Why people are switching to Regimen
"I finally feel in control of my weight loss journey. The photo comparison feature is addictive. Seeing my progress next to the tracking data motivates me way more than just the number on the scale."
Sarah K., GLP-1 User
"Started Zepbound a few months ago and needed something to track my doses and weight. This app is perfect, reminders keep me on schedule, I can log my injections and see my progress all in one place. The progress photos feature is really motivating too."
Nooshnili, USA
How we built the retatrutide tracker
Retatrutide is in Phase 3 trials, not yet FDA-approved, and only available through compounding pharmacies. There's no manufacturer dose schedule, no standard pen strength, and no insurance reimbursement pathway. The compound is also genuinely novel: it's a triple agonist (GLP-1, GIP, glucagon) rather than the single or dual mechanisms of semaglutide and tirzepatide, so the side-effect and response patterns people see don't always map neatly onto what they expect from prior GLP-1 experience.
That novelty is exactly why people tracking retatrutide tend to want more rigor, not less: they want to compare their week-by-week numbers to the published Phase 2 trial data, watch lab work closely, and log enough side-effect detail to spot patterns specific to retatrutide's triple-agonist mechanism.
Regimen's retatrutide tracker is built for that:
- Flexible dose logging: log any mg per week without a fixed pen-strength selector. Most compounded retatrutide is dispensed in vials at varying concentrations, so the calculator handles whatever your pharmacy is using.
- Side-effect tracking across 50+ markers: nausea, vomiting, constipation, diarrhea, sulfur burps, the food-stuck feeling, fatigue, sleep quality, mood, energy, appetite, plus custom markers. Fatigue and GI patterns tend to be the most-logged retatrutide-specific observations on the app.
- Phase 2 trial comparison: chart your weight trajectory against the published Phase 2 data (Jastreboff et al., NEJM 2023) so you can see how your response compares to trial averages at each dose level.
- Lab tracking: HbA1c, fasting glucose, lipid panel, hematocrit. Each lab pull plots on the dose timeline so trends are visible.
- Apple Health and Google Health Connect: weight, resting heart rate, sleep, blood pressure auto-sync.
- Multi-compound support: many people running retatrutide also track at least one other compound (TRT, a peptide, an oral medication). The app handles them together in one timeline.
Your data stays private
Your health data is stored securely. We never share, sell, or monetize your information. What you track is your business, not ours.
Stop guessing. Start optimizing.
Your GLP-1 routine deserves better than a notes app and a calendar.