Half-life reference / Library model input
Retatrutide half-life
The PinPoint library stores 144 hours (6 days) for Retatrutide. This is the input behind the arithmetic below, not a measurement of your levels or how long an effect lasts.
Clinical publication: approximately six-day half-life and subcutaneous exposure, used for tracking only.
Library snapshot, 2026-10-05: CompoundLibrary.swift:650, halfLifeHours: 144. Read the cited reference.
Reading this particular reference
The six-day input places retatrutide between the five-day tirzepatide reference and the seven-day semaglutide reference in this library. That ordering compares model timing only. It says nothing about relative effects, appropriate amounts, or interchangeability. A seven-day calendar marker comes just after one modeled half-life. The library source identifies a clinical publication and explicitly limits the stored values to tracking; the arithmetic here retains that distinction.
The library source note states approximately six days and does not supply a numerical range. The library lists subcutaneous for tracking. A listed route is not proof that every input was measured through that route. The linked reference and its study context matter when interpreting the stored number.
Retatrutide decay table
Starting at an arbitrary 100%, each elapsed half-life divides the remaining modeled amount by two. The calculation is 100 × 2 raised to the power of minus elapsed hours divided by 144. It describes a single contribution with no additional entries. The percentages are not percentages of benefit, receptor activity, or symptom relief.
| Half-lives | Hours | Days | Remaining (rounded) |
|---|---|---|---|
| 0 | 0 | 0 | 100.0% |
| 1 | 144 | 6 | 50.0% |
| 2 | 288 | 12 | 25.0% |
| 3 | 432 | 18 | 12.5% |
| 4 | 576 | 24 | 6.3% |
What the listed schedules mean mathematically
The library labels are Every 7 days. They describe available tracking patterns, not instructions. In an equal-input model, the limiting peak accumulation ratio is 1 ÷ (1 − 2 raised to minus interval divided by half-life). It compares a repeated pattern with one instantaneous input and assumes the same interval continues indefinitely.
- Every 7 days, if evenly spaced: 168 hours between entries; 44.54% of one contribution remains at that marker; limiting accumulation ratio 1.803.
About five half-lives here is 720 hours, or 30 days. Under the same linear assumptions, that is approximately the approach to steady state. Changing amounts, missed entries, irregular spacing and absorption change the pattern. The calculation does not decide when to start, stop, or change anything.
From a reference curve to a dose history
PinPoint’s Home curve models your levels between doses from published half-life data. Drag to scrub modeled values at any timestamp, or preview 30 days of a dose pattern. Log injections with compound, dose, site, and pain level, and backfill past doses so the history is complete from day one.
The graph on this page is simpler: it isolates exponential elimination so you can inspect the arithmetic. PinPoint’s modeled curves are mathematical visualizations of published population averages and do not account for individual variation. A modeled amount is not a laboratory concentration.
Explore dose logging in PinPoint or compare library half-life inputs.
Questions, answered
Is the half-life of Retatrutide the same for everyone?
No. Half-life varies with the person, formulation and study context. The library source note states approximately six days and does not supply a numerical range. The stored number is a reference input, not a personal measurement.
How long until Retatrutide clears?
With the stored 144-hour scalar, five half-lives take 720 hours (30 days), leaving 3.125% of one modeled starting contribution. Exponential decay never reaches exactly zero. This is not a detection window, a washout instruction, or proof that effects have ended.
What does steady state mean?
For unchanged, equally spaced inputs in a linear model, steady state means the pattern repeats from one interval to the next. About five half-lives gives roughly 97% of the limiting pattern. Peaks and troughs still occur; steady state does not mean a flat line or a recommended regimen.
PinPoint is a tracking and unit-conversion tool, not a medical device. Modeled levels are mathematical illustrations, not blood tests or individual predictions. Medical decisions belong with your healthcare provider.