10-01-2022, 11:35 PM
I found a dissertation where they look at the ingredients of walnut leaves. Unfortunately (well, for most of you) it is in German: https://doi.org/10.5283/epub.41118
They start off with 3.3kg of dried leaves and end up with four fractions totalling 11.5mg that contain (are?) progesterone. Table 4-11 in that dissertation also confirms that there are no other plants documented to contain progesterone.
I also found a website with an estimate for the boiling point of progesterone. It is estimated to be around 394°C. I think I'll heat the pulverized leaves in oil to around 150°C to disinfect them before casting suppositories.