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.
GIP / GLP-1 / Glucagon Triple Agonist — Currently in Phase 3 Clinical Trials
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.
Regimen is the retatrutide tracker app for early adopters tracking this next-generation triple-agonist. Retatrutide targets GLP-1, GIP, and glucagon receptors simultaneously — a mechanism that clinical trials show produces significant weight loss. Regimen helps you log every dose, track your weight and body composition changes, monitor side effects, and see how this novel medication affects your health metrics. Whether you're in a clinical trial or accessing retatrutide through other channels, Regimen tracks it — with compound data built on published pharmacokinetic studies. Free — every feature unlocked for your first medication. No paywall, no trial, no credit card. 4.9 stars.
Retatrutide is uncharted territory. Track everything.
A triple agonist in Phase 3 trials means you're early:
No FDA-approved dosing guidelines yet — you're relying on clinical trial protocols and compounding pharmacies
Tracking a compound with three mechanisms of action (GIP + GLP-1 + glucagon) and no established community dosing norms
Documenting your experience when there's barely any real-world data to compare against
Dose with precision
Regimen handles the complex math so you don't have to. Two built-in calculators give you exact numbers every time.
Peptide reconstitution calculator
Input your vial size, bacteriostatic water volume, and desired dose. Regimen tells you exactly how many units to draw on your syringe.
mL dose calculator
Enter your prescribed dose (mg) and concentration (mg/mL) to get the precise injection volume. Perfect for testosterone and oil-based compounds.
Never miss a dose. Never miss a cycle.
Stay consistent with zero effort. Regimen supports every dosing schedule you could need, with smart reminders to keep you on track.
Every schedule you need
Daily · specific days · split-week · every X days · twice daily · as-needed. Injections, pills, creams, sprays. Your protocol, your way.
Cycle management
Set your cycle duration and get alerts when it's time to cycle off or begin again. No more mental math or calendar counting.
See what's actually working
Correlate every compound and dose change against real health data. Stop guessing which protocol is moving the needle.
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.
Track how you feel, not just what you measure
Log energy, sleep quality, cravings, and daily notes alongside your biometrics. See the full picture of how your protocol affects you day to day.
Correlate medications with health trends
Changed your TRT dose three weeks ago? See exactly how your weight, sleep, and heart rate 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 40+ 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
Standard retatrutide titration schedule
This follows the Phase 3 trial protocol. Many community protocols are slower (especially extending the lower doses), but this is the reference framework:
| Week | Weekly Dose | What to expect |
|---|---|---|
| 1-4 | 2mg | Initial appetite suppression, mild GI side effects |
| 5-8 | 4mg | Continued weight loss, side effects often improve as body adapts |
| 9-12 | 8mg | Common maintenance dose, many users hold here long-term |
| 13-16 | 12mg | Phase 3 maximum, biggest losses but tighter side effect window |
| 17+ | 4-8mg | Maintenance, dosed down once at target weight |
Side effects, not response, usually determine the practical maximum dose for an individual.
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 washout window (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 was juggling my peptide schedule between a notes app and my calendar, and I was constantly stressed about missing a dose. Regimen fixed all of it. The reminders and calculator are essential."
Alex T., Bio-Optimizer
"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
How Regimen compares to other apps for tracking retatrutide
Most GLP-1-only tracker apps don't formally support retatrutide because it isn't FDA-approved yet, so retatrutide users tend to use general health-tracking apps or build their own spreadsheets.
| App | Retatrutide Support | Side Effect Tracking | Lab Integration | Multi-Compound | Apple Health | Free Tier | Price |
|---|---|---|---|---|---|---|---|
Regimen | Flexible dosing, any mg/week | 50+ markers | Full lab tracking with dose overlay | Unlimited compounds (Pro) | Apple Health + Google Health Connect | One compound free | $4.99/month Pro |
| Not listed as a tracked compound | Standard GI side effects | No | GLP-1 only | Read-only | Limited | $49.99/year | |
| Focused on FDA-approved GLP-1s | Common side effects + food noise | No | GLP-1 only | Yes | Fully free | Free | |
| Not listed as a tracked compound | 18 markers + custom | No | GLP-1 only | Yes | Trial, then paid | $10/month | |
Spreadsheet | Whatever you build | Whatever you build | No | Yes | No | Yes | Free |
Sources verified May 24, 2026: Shotsy (App Store + Google Play), Glapp (App Store; Android is a PWA), MeAgain (App Store + Google Play). Pricing reflects current published model per each app’s listing. Feature coverage based on publicly available app descriptions as of May 2026.
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.
Frequently Asked Questions
How do I calculate retatrutide doses from a reconstituted vial?
Enter your vial concentration, the bacteriostatic water you added, and your target dose in milligrams. Regimen converts that to exact units on a U-100 insulin syringe and saves the recipe so you only do the math once per vial.
Can Regimen handle the full retatrutide titration up to 12 mg?
Yes. Log each step (1, 2, 4, 8, 12 mg) with timestamps. Because retatrutide is still investigational, protocols vary, so the app stores any custom titration cadence rather than forcing a fixed schedule.
Does Regimen model retatrutide blood levels?
Yes. The PK curve uses published clinical data from the Phase 2 and Phase 3 retatrutide studies. Estimates update as new pharmacokinetic data is released. This is informational modeling, not a clinical tool.
Can I track retatrutide alongside other GLP-1s or peptides during a switch?
Yes. Many users move from semaglutide or tirzepatide onto retatrutide. Regimen keeps the prior dose history and weight trend continuous, so your titration onto retatrutide lines up against where you left off on the previous compound.
What retatrutide side effects can I log?
GI symptoms (nausea, vomiting, diarrhea, constipation, reflux), plus fatigue, sleep quality, mood, appetite intensity, food aversion, and the food-stuck feeling. Custom markers cover injection-site reactions, heart-rate changes, or anything else specific to the triple-agonist profile.
How does Regimen compare to Shotsy, Glapp, or MeAgain for retatrutide tracking?
See the comparison table above. Short version: most GLP-1 trackers do not support retatrutide at all because it is not FDA-approved. Regimen treats it as a first-class compound with PK modeling, lab correlation, and multi-compound stacking on the free tier.
Is there a free retatrutide tracker in Regimen?
Yes. The free tier covers one compound, including retatrutide, with full dose logging, side effects, weight sync, and lab tracking. Pro ($4.99/month) unlocks multi-compound stacks and the Signals pattern engine.
Is retatrutide safe to track outside a clinical trial?
Retatrutide is investigational and not FDA-approved. Regimen does not source, recommend, or endorse retatrutide use outside a supervised setting. The tracker exists so users who are already on a protocol can keep a clean dose, weight, and side-effect record to share with a clinician.
Stop guessing. Start optimizing.
Your protocol deserves better than a notes app and a calendar.