Retatrutide half-life and pharmacokinetics chart
Pre-filled plasma half-life model for Retatrutide. See how a 6 days half-life affects steady state, accumulation, peak-trough swing, and clearance timing.
Preset values: 2000 mcg every week, half-life ~6 days.
Half-life of ~6 days; weekly cadence in phase 2 trials produced steady-state in ~4 weeks.
Open interactive chart →Why these values?
The half-life used here (6 days) is the published or well-established estimate for Retatrutide from pharmacokinetic studies. The default dose (2000 mcg) and cadence (every week) reflect typical standard protocols — not a prescription or recommendation. Your specific product's label and your clinician's protocol override any default here.
Accumulation. With a half-life of 6 days and dosing every week, the ratio τ/t½ = 1.17 gives an accumulation factor of ~1.80×. That means the steady-state peak plasma mass is about 1.8× the mass of a single dose.
Time to steady state. Approximately 5 half-lives (~30.0 days) of consistent dosing before average concentration stops rising. Dose-escalation protocols that change doses before this point are titrating against a still-rising baseline, which is one reason weekly peptides feel "slow" at the start.
How long does Retatrutide stay in your system?
After a single dose, half of the Retatrutide is gone in about 6 days, 97% is cleared in about 30 days (five half-lives), and under 1% remains after about 40 days.
| Cleared | Remaining | Half-lives | Time after one Retatrutide dose |
|---|---|---|---|
| 50% | 50% | 1 | 6 days |
| 75% | 25% | 2 | 12 days |
| 90% | 10% | 3.3 | 20 days |
| 97% | 3% | 5.1 | 30 days |
| 99% | 1% | 6.6 | 40 days |
Between doses. At every week, doses land 1.17 half-lives apart, so about 45% of the peak is still present when the next dose goes in. The steady-state swing in this model runs from ~3607 mcg at peak to ~1607 mcg at trough — a moderate swing with meaningful carry-over from one dose to the next.
A first-order, one-compartment model: it leaves out absorption delay from the injection depot, protein binding and individual differences in clearance, and effects can outlast plasma levels. Good for dosing rhythm; not clinical pharmacokinetics.
Retatrutide half-life FAQ
What is the plasma half-life of Retatrutide?
This chart uses an estimated Retatrutide plasma half-life of about 6 days. Published values can vary by formulation, route, assay, and study design.
How long until Retatrutide reaches steady state?
A simple first-order model reaches practical steady state after about five half-lives, which is roughly 30.0 days for Retatrutide.
How long does Retatrutide stay in your system?
After a single dose, half of the Retatrutide is gone in about 6 days, 97% is cleared in about 30 days (five half-lives), and under 1% remains after about 40 days. Those are plasma estimates from a half-life of 6 days; effects can outlast plasma levels, and detection windows depend on the assay.
How much Retatrutide is left when the next dose is due?
Dosing every week is 1.17 half-lives apart, so about 45% of the peak level remains at the next dose. At steady state that means a peak of ~3607 mcg and a trough of ~1607 mcg in the model.
Does this Retatrutide pharmacokinetics chart recommend a dosing schedule?
No. It visualizes half-life, accumulation, peaks, and troughs from values you enter. It is not a prescription, dose recommendation, or substitute for the product label or clinician guidance.
Why does steady state matter for Retatrutide?
Steady state explains why long-half-life compounds can keep rising for weeks after starting or changing a dose, while short-half-life compounds behave more like brief pulses.
Related for Retatrutide
Half-life charts for related peptides: Tirzepatide (5 days), Liraglutide (13 hours), Semaglutide (7 days), Survodutide (7 days).
Track your real Retatrutide protocol
Peptide Protocol logs every actual injection time and shows your real timeline — not a model. Side-effect tracking included.
Get the iPhone app →Educational use only. Nothing on this page constitutes medical advice. Pharmacokinetic parameters are published estimates; individual PK varies. Use label values and consult a clinician for any dosing decision.
Educational use only. Peptide Protocol is an informational tool. Nothing on this page constitutes medical advice. Many peptides are prescription-only or restricted in your jurisdiction. Always consult a licensed healthcare professional before injecting any compound.