Half-life estimate, not bloodwork or dosing advice. Disclaimer.
Long ester. About 63% parent hormone. Slow rise, heavy accumulation, and a long washout — useful for seeing how a long half-life changes the curve.
The default row models 750 mg as an intramuscular dose, every 10 days, for 12 weeks.
Also called Testosterone undecanoate, Aveed.
| Half-life | 21d |
|---|---|
| Time to peak | 7d |
| Parent hormone | 63% |
| Default dose | 750 mg |
| Default frequency | Every 10 days |
| Default duration | 12 weeks |
On that default row the model counts 9 doses. Steady state is about day 105. Washout runs to about day 112. In the last interval the peak is 1595 mg and the trough is 1414 mg, a swing of 11%.
About 63% of each milligram is parent hormone, so 100 mg of Testosterone undecanoate leaves about 63.0 mg of Testosterone.
A half-life of 21d means the line keeps rising for weeks and clears slowly after the last dose.
Test E has a half-life of 4.5d against 21d on this page. Parent hormone is 72% there against 63% here.
Ester fraction ~0.63 from testosterone ester tables; injectable undecanoate half-life is commonly cited around 3 weeks. How the model works.