TB-500 Tracker

TB-500 is a synthetic fragment of Thymosin Beta-4 studied for systemic healing and cell migration. This page covers its half-life, what that timescale means for keeping a usable record, and a worked reconstitution example — not what to take or how much.

What TB-500's timing means for tracking

TB-500 is the clearest example in the whole catalogue of why half-life alone is a misleading number. Its half-life is about 2 hours — but its estimated activity window is around 48 hours, more than twenty times longer.

Those two figures measure different things. Half-life describes how quickly the compound itself leaves. The activity window describes how long the response it sets in motion persists. For TB-500 the compound is gone by lunchtime while what it triggered is still running two days later.

This matters for tracking in a specific way: a chart drawn only on half-life would show almost nothing — a spike and an immediate collapse, every time, with no relationship between entries. That would be actively misleading. It is why PepTrack models the activity window alongside the half-life rather than plotting decay on its own.

What to capture in the log

• Date matters more than clock time here — the activity window spans days, so an hour either way changes little.
• Gaps are the useful signal. With a ~48-hour window, the interval between entries says more than any single entry does.
• Don't read a flat half-life curve as 'nothing is happening' — the two measures diverge more for this compound than almost any other.

Worked reconstitution example

Purely as arithmetic, using round numbers rather than a recommendation. If a 10 mg vial were mixed with 2 mL of bacteriostatic water, the concentration would be 5 mg/mL. Measuring 2.5 mg from that would come to:

Frequently asked questions