You will hear widely differing opinions as to the effects (or lack thereof) of taking progesterone! Theories abound, not much hard data around either way that I've seen yet*, mostly I see people saying "this happened to me, and it's because I took progesterone" but it's often not clear how they are sure that was the cause.
*I've just been taken to task for this - apparently there are good studies that have been done - though I haven't seen any study results myself, is what I meant.