Half-life reference / Low-confidence model input
TB-500 half-life
The PinPoint library stores 3 hours (0.125 days) for TB-500. This is the input behind the arithmetic below, not a measurement of your levels or how long an effect lasts.
Human thymosin beta-4 intravenous reference; subcutaneous values are extrapolated for TB-500-related tracking.
Library snapshot, 2026-10-05: CompoundLibrary.swift:475, halfLifeHours: 3. Read the cited reference.
Reading this particular reference
TB-500-related tracking uses a reference concerning human intravenous thymosin beta-4. Those are important distinctions: the label on a library entry and the material, route, and context in a publication need not be identical. The stored three-hour scalar is therefore displayed as an extrapolated tracking input. The library lists twice-weekly and every-other-day entries, neither of which turns the source into a validated subcutaneous model.
The library source note does not establish a TB-500 human half-life range. The library lists subcutaneous, intramuscular 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.
TB-500 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 3. 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 | 3 | 0.125 | 50.0% |
| 2 | 6 | 0.25 | 25.0% |
| 3 | 9 | 0.375 | 12.5% |
| 4 | 12 | 0.5 | 6.3% |
What the listed schedules mean mathematically
The library labels are Twice weekly; Every other day. 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.
- Twice weekly: no unique fixed interval is specified, so no accumulation ratio is assigned.
- Every other day, if evenly spaced: 48 hours between entries; 0.001526% of one contribution remains at that marker; limiting accumulation ratio 1.
About five half-lives here is 15 hours, or 0.625 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 TB-500 the same for everyone?
No. Half-life varies with the person, formulation and study context. The library source note does not establish a TB-500 human half-life range. This library input is low confidence and is not an established individual human value.
How long until TB-500 clears?
With the stored 3-hour scalar, five half-lives take 15 hours (0.625 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.