Proviron half-life
Proviron (mesterolone) is an oral androgen, a synthetic derivative of DHT, and it clears the body at a moderate pace, with a plasma half-life of about 12 hours. Because the amount in the blood falls by roughly half within about half a day, it is usually split into divided doses through the day rather than taken all at once, and steady daily use lets the level build to a plateau over a few days. Its main metabolites are inactivation products cleared mostly in the urine, so they do not meaningfully extend how long the drug stays in the blood.
What a half-life actually means
A half-life is the time it takes for half of what is in your blood to be gone. It does not mean the compound is finished at that point. Half goes, then half of what is left goes, and so on.
That is why the last traces take so much longer to disappear than the first. Most references treat something as effectively cleared after about five half-lives, which for Proviron is roughly 2.5 days.
How Proviron clears
| Half-lives | Time since dose | Roughly left |
|---|---|---|
| 1 | 12 hours | 50% |
| 2 | 24 hours | 25% |
| 3 | 36 hours | 12.5% |
| 4 | 2 days | 6.25% |
| 5 | 2.5 days | 3.125% |
These are round numbers from a single half-life figure. Real clearance shifts with dose, body composition, liver and kidney function, and what else you are taking. Treat it as a shape, not a schedule.
Why the timing matters
A short half-life means levels swing between doses, so timing and frequency do most of the work. A long half-life means levels build for days or weeks before they settle, so a change you make today might not show up for a while, and stopping does not clear things straight away.
Proviron sits at about 12 hours, so it behaves like the short end of that range.
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