To get an idea of how well fx works look over the diary sheets on this page of the web site.
http://www.nutrafx.co.uk/fxmeno-flush-diary.htm
fx performs as well as GP prescribed HRT with first signs of improvement, e.g. 50% drop in flushes and sweats, anywhere from 2 days to 5 weeks for over 80% of women. NutraFX usual suggest a 4 week trial as this gets things started for most women. From then on expect to gradually improve and need less capsules.
Re Progesterone; If your fairly healthy, look after your diet and are having a normal menopause or have had a hysterectomy you simply do not need it, fx does everything.