Tools · TRT
Testosterone ester half-life visualizer
Pick an ester, a dose, and how often you inject, and see the shape it makes: how levels build over the first weeks toward a steady state, and how much they swing between shots. This draws the shape from the ester's half-life. It is a teaching picture, not a blood level.
Steady-state peak
220rel.
Steady-state trough
120rel.
Peak-to-trough swing
1.83x
Higher = bigger ups and downs between shots.
Relative serum level over 10 weeks
Illustrative shape only, in relative units. Not a predicted blood level.
Read this before you read the chart
This is an illustrative teaching model, not a validated pharmacokinetic simulator and not a predicted blood level. It draws a relative curve by decaying each injection from the ester's published half-life and adding them up. It ignores absorption time, individual clearance, injection site, and everything an assay would actually measure, so the numbers are unitless and relative, not ng/dL. Use it to see the shape - how levels stack up and swing between shots - not to plan a protocol. It is math only, not medical advice. Always verify with a licensed provider. Testosterone is a controlled substance in many places.
How the model works, and what it is not
Each injection is treated as an instant input that then fades by simple first-order decay from the ester's published half-life: after one half-life, half remains; after two, a quarter; and so on. The curve is the sum of every past injection still decaying. Repeat often enough and the leftovers stack up until each new dose only replaces what cleared between shots - that plateau is the steady state, reached after about four to five half-lives. A shorter half-life means bigger swings between injections at the same interval.
What this is not: it is not a predicted blood level and not a validated pharmacokinetic simulator. It ignores absorption time, how fast your body clears the drug, the injection site, and assay differences, so the numbers are relative and unitless, not ng/dL. Read it for the shape, never as a protocol.