Your level curve, personalised
Every dose you inject stacks on top of the last. Standard titration protocols were designed for population-level trials — they have no mechanism to find or hold your therapeutic window. Retadose models your real-time retatrutide level and estimates a suggested dose to keep you there.
"I built this because I was that person. 1 mg every four days and I couldn't focus, couldn't eat, missed workouts. The dose hadn't changed. My level had been silently stacking for weeks.
Retatrutide isn't supposed to crash you — it's supposed to let you train, eat well, and lose fat without sacrificing muscle. That's what finding your level actually means."
The problem
Retatrutide's half-life is ~6 days. Prior doses are still active when you inject the next one. Without visibility into total level, you're dosing blind.
The titration schedule was designed to escalate entire trial populations. It has no mechanism to identify — or hold — your individual therapeutic window.
You should still eat. You should still train. Retadose targets the level where appetite is controlled and energy and performance are preserved.
How it works
Date, time, amount in mg. That's it.
Retadose models your estimated retatrutide concentration using published PK constants from Coskun et al. 2022.
Tell us when you feel optimal: appetite controlled, sleep good, energy up. That's your target level.
Retadose estimates what to inject next — and when — to return to your window.
Built for people on compounded retatrutide who take their protocol seriously. Log your doses, track your level, and bring a complete export to your next prescriber visit.
Create your account →FAQ
Retadose is a free pharmacokinetic (PK) tracking tool built specifically for retatrutide. It models your real-time drug concentration using published PK parameters from Coskun et al. 2022 and estimates a suggested dose to keep you in your personal therapeutic window.
Retatrutide has a half-life of approximately 6 days (144–165 hours). Each injection is still partially active when you take the next one, causing drug levels to accumulate — or "stack" — over successive doses. Without visibility into this stacking, you can overshoot your therapeutic window and experience unnecessary side effects.
No. Retadose is a pharmacokinetic estimation tool based on published research data. It is not a medical device and has not been evaluated by the FDA. Dose suggestions are calculated estimates, not prescriptions. Always review dosing decisions with your prescriber.
Retadose uses a one-compartment pharmacokinetic model with subcutaneous absorption. The model parameters — elimination rate, absorption rate, and volume of distribution — are derived from published human PK data (Coskun et al. 2022, Cell Metabolism). Your logged dose history is fed into this model to produce a real-time concentration curve.
Yes, Retadose is completely free. There is no subscription, no paywall, and no premium tier. Create an account and start tracking immediately.
No download is required. Retadose is a progressive web app (PWA) that runs in your browser. You can add it to your home screen on iOS or Android for an app-like experience, but it works fully in any modern browser.
Retadose collects only the data you enter: your dose log (date, time, amount), check-in responses, and account credentials (email and password). We do not sell or share your data with third parties. All data is stored encrypted and can be exported or deleted at any time.
Yes. Retadose has a built-in data export feature that generates a complete log of your dose history and PK curve. You can share this with your prescriber to support informed dosing decisions.