Half-life calculator
Retatrutide half-life calculator
Retatrutide is an investigational triple GLP-1/GIP/glucagon agonist (not yet approved). Its elimination half-life is about 6 days, so a dose largely clears in roughly 30 days. See how it rises as it absorbs, peaks, and falls below.
Runs entirely in your browser. Nothing is sent anywhere.
Steady-state peak
5.66 mg
Half-life
6 days
Reaches steady state
~4 weeks
Accumulation
1.8×
Solid = while you're dosing; dashed = projected clearance after the last dose. The curve rises as each dose absorbs, then falls — and climbs over the first several doses until it settles into a steady peak-and-trough.
How long does Retatrutide stay in your system?
A compound is considered essentially cleared after about five half-lives. With Retatrutide's half-life of about 6 days, that's roughly 30 days after your last dose. The calculator's dashed line shows that clearance tail.
Retatrutide steady state & accumulation
Dosed weekly, each Retatrutide dose is given before the previous one fully clears, so levels climb over the first several doses and settle into a steady peak-and-trough pattern in about 4 weeks, building to about 1.8× a single dose. That accumulation is why the early weeks can feel different from later on, and why a gradual titration gives your body time to adjust.
Questions
Retatrutide half-life, answered
What is Retatrutide's half-life?
Retatrutide's elimination half-life is approximately 6 days, the time for its level in the body to fall by half. This is an approximate figure for illustration; reported values vary.
How long does Retatrutide stay in your system?
A compound is essentially cleared after about five half-lives, so Retatrutide largely clears in roughly 30 days after your last dose.
How long until Retatrutide reaches steady state?
Dosed weekly, Retatrutide climbs over the first several doses and reaches a steady peak-and-trough pattern in about 4 weeks, building to about 1.8× a single dose.
Does Retatrutide accumulate between doses?
Yes. At weekly dosing the model shows roughly 1.8× accumulation at steady state, because each dose is given before the previous one has fully cleared.
Track your Retatrutide privately
Log your doses, schedule, and how you feel, on your device, with no account.
Other half-life calculators
This is a simplified one-compartment model with first-order absorption, for education, not medical advice or a guarantee of how Retatrutide behaves in your body. Many peptides are not FDA-approved and are sold for research use only; Lirea neither sells nor supplies any compound.
Launching soon
Keep it, and keep it yours.
Track your weekly dose, your titration, and how you’re feeling, all on your device. No account required. Be first to know when Lirea is live.