just my guess, but if you are ON steroidogenesis halted, so if you supplement top source (cholesterol and pregnenolone) it doesnt matter, end product is too high (test/estro) some enzymes might be low or down regulated however you want to say it
so you feed it back from the bottom, DHEA
i dont get any libido effect from DHEA but its a good immune system support
pregne itself is a neurosteroids so you couold try it for other purpose than hoping it would convert to dhea or whatever.
it could convert to cortisol, which can be good or bad depending on the situation you are at.
i take 30mg in the morning, for cort support/nootropic (maybe)
also 25mg dhea morning and night for the reason above