Free tool
Half-life visualizer
Pick a compound, a dose, and how often you take it. You'll see the level rise as each dose absorbs and fall as it clears, and where it settles once you've been dosing for a while (the "steady state").
Runs entirely in your browser. Nothing is sent anywhere.
Steady-state peak
0.798 mg
Half-life
6.9 days
Reaches steady state
~5 weeks
Accumulation
1.98×
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 the curve works
An injection doesn't hit its peak instantly; it absorbs over time, so the level rises to a peak and then falls. Each dose also adds to whatever is left from the doses before it, so with weekly medications like the GLP-1s, levels climb over the first several doses and then settle into a repeating peak-and-trough pattern: that's steady state. It's why the early weeks feel different from later ones, and why a gradual titration gives your body time to adjust.
The accumulation figure is how much higher the steady-state peak is than a single dose alone. This is a simplified one-compartment model with first-order absorption; the built-in half-life values are approximate (well-characterized for the GLP-1s, rougher for peptides), and your own numbers vary, so pick Custom to enter your own.
Half-life by compound
Pick a compound for its half-life & steady state
GLP-1 medications
Peptides
This is an educational model, not medical advice or a guarantee of how any compound behaves in your body. Follow the guidance of a qualified healthcare provider.
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