Half-life estimate, not bloodwork or dosing advice. Disclaimer.
Primobolan Depot. Enanthate ester of methenolone; often plotted next to testosterone at a similar schedule.
The default row models 200 mg as an intramuscular dose, twice a week (e3.5d), for 12 weeks.
Also called Methenolone enanthate, Primobolan, Primobolan Depot, Primo E, Primo Steroid.
| Half-life | 4.5d |
|---|---|
| Time to peak | 2d |
| Parent hormone | 70% |
| Default dose | 200 mg |
| Default frequency | Twice a week (E3.5D) |
| Default duration | 12 weeks |
On that default row the model counts 24 doses. Steady state is about day 22.5. Washout runs to about day 24.5. In the last interval the peak is 336 mg and the trough is 267 mg, a swing of 21%.
About 70% of each milligram is parent hormone, so 100 mg of Methenolone enanthate leaves about 70.0 mg of Methenolone.
A half-life of 4.5d means a dose is still present at the next one, so the line climbs and then levels off.
Test E has a half-life of 4.5d against 4.5d on this page. Parent hormone is 72% there against 70% here.
Test E 500 + Primo 400 plots 200 mg twice a week (e3.5d) for 16 weeks. It is an illustration already in the app, not a protocol to follow.
Ester fraction ~0.70; injectable primobolan uses the enanthate ester (~4.5 d). How the model works.