In an interview he said he knew a male who was an ex-alcoholic who took around a tablespoon a day for his whole life after he recommended it
Oral Progesterone Increases Testosterone And DHT
This rodent study shows that a hefty oral dose of progesterone stimulated synthesis of and elevated the levels of both testosterone and DHT. It seems that if progesterone has any negative effects on male steroids it requires dosages higher than the ones used in the study. Speaking of dosages, the human equivalent dose was 5.7mg/kg, so this means a range of 450mg - 600mg for most people.
Humans take such doses of progesterone consistently and feel good? Aren't high level of progesterone contraceptive anyway for females?
Notice that you will see doses of 100mg and 200mg of progesterone for transgenders, but then they are also on estradiol and other anti-androgens so I am not sure how much it matters hot much they take, but surely it is taken for feminization purposes (weather it is actually working as such or not in practice).