The companion app for Retatrutide weight loss.
Retatrutide is an investigational triple GIP/GLP-1/glucagon receptor agonist still in clinical trials — and WeightLytic is being built to track it the day it becomes available to you. WeightLytic ties your doses, food, protein and weight together — so every clinic conversation is backed by real data, not memory.
Week 14
Mounjaro
Next injection
Thursday · 8:00pm
7.5mg · Left thigh rotation
Supply
Pen #3 of 4
22 days left
Side effects
Total lost
−11.6 kg
Everything a Retatrutide user actually needs.
One app for your medication, your meals and your trajectory — instead of three apps and a notebook.
Retatrutide dose log
Record every injection with date, time, strength and site. Build a complete medication history you can hand to your doctor.
Reminders & site rotation
Smart injection reminders that fit your weekly schedule, plus a site-rotation map to keep absorption consistent.
Side-effect tracking
Log nausea, fatigue, appetite and mood against each dose, so you and your clinician can spot patterns.
Supply & refill alerts
Know exactly how many days of medication you have left and get a heads-up before you run out.
AI food & protein tracking
Snap a photo to log meals, and keep protein on target to help protect muscle while you lose weight.
Weight forecasting
See a projected trajectory from your own data — shown as a confidence range, never a guaranteed outcome.
Retatrutide works best with clear data.
Retatrutide (investigational) is most effective when paired with consistent food, protein and weight tracking. WeightLytic brings it together so your progress is something you can actually see — and show your prescriber.
Doses
Logged with date, time, strength & site
Protein
Daily targets to help protect muscle
Supply
Refill alerts before you run out
Symptoms
Side effects tracked against dose
More on Retatrutide.
Common Retatrutide questions.
Is Retatrutide approved and available?
Not yet. Retatrutide is an investigational medicine still in clinical trials and is not approved for general prescription. If you are taking it, that is through a clinical trial or your clinician.
Can I track Retatrutide in WeightLytic?
Yes. You can log each dose with date, time, strength and site, and record side effects, protein, food and weight alongside it — useful whether you are in a trial or tracking for your own records.
Does WeightLytic recommend or change my Retatrutide dose?
No. WeightLytic never suggests or adjusts medication doses — follow your prescriber or trial protocol. We only help you record and visualise what is happening.
Will it forecast my weight loss on Retatrutide?
It projects a trajectory from your own logged data, shown as a confidence range rather than a guaranteed outcome. Everyone responds differently.
When does WeightLytic launch?
WeightLytic is launching July 2026. Join the waitlist to be first in and to lock in founding-member pricing; there will be a free tier at launch.
Get WeightLytic when it launches.
Join the waitlist to lock in founding-member pricing. Launching July 2026.
Also for: Mounjaro · Ozempic · Wegovy · Zepbound · all GLP-1 medications
WeightLytic is an independent app and is not affiliated with, endorsed by, or sponsored by Eli Lilly. Retatrutide is an investigational drug developed by Eli Lilly and is not yet approved by regulators. WeightLytic does not provide medical advice — always follow your prescriber or trial protocol.