Half-life estimate, not bloodwork or dosing advice. Disclaimer.
Short ester, with more parent hormone per milligram than the long esters. Its curve rises and falls within a few days, unlike longer esters. A 50 mg dose is about 42 mg of testosterone, and that is what the line draws. Also called Testosterone propionate, Test Prop, Propionate. The half-life is an estimate. Methodology.
| Half-life | 19h |
|---|---|
| Time to peak | 1d |
| Parent hormone | 84% |
| Example input | 50 mg |
| Example frequency | every day |
| Example length | 12 weeks |
| Data quality | Low |
No human study gives a half-life for the propionate; 0.8 d and Tmax 1 d are community estimates (Fujioka et al. 1986 shows about 2 days of raised levels after 25 mg). 84% testosterone by weight (PubChem MW). How the model works.
50 mg every day for 12 weeks. With a 19h half-life, it levels off around day 5. The row runs longer than that, so the plateau is on the chart. The gap between doses is no longer than the model's time to peak (1d), so each dose is still rising when the next one lands and the line comes out flat. Real levels still rise and fall between doses. After the last dose, the tail takes about 5.3 days to fall to a few percent.