Suggest Treatment For Beard Growth

I use minoxidil for beard growth. After 11 months i have a pretty decent beard from almost nothing but most of it is vellus. I know people personally who have done this managed to get their hairs to terminal and have kept what they have gained upon cessation of minoxidil (they stopped almost two years ago). Recently i asked a dermatologist on a seperate board who suggested progesterone cream. Problem is that to my knowledge it inhibits the enzyme 5a-reductase which converts testosterone to dht. I know from studying it that dht is essential for maturing and the linear growth of facial hair. Now i dont claim to know more than him and i know this is an off label use and the science is in somewhat of a gray area. Nevertheless using an anti androgen (dht in this case) like progesterone would surely be the opposite of what i am trying to achieve by maturing the follicle to shed the vellus and regrow a terminal hair which as i say is the way i know friends of mine have achieved permanent results. I have the feeling he maybe didnt read my post and provided advice based on scalp hair. Can anyone offer advice. It seems i am yet to find the key to maturing the vellus i have attained