Estroven is an over the counter supplement. It can be found at most Wal-Marts, Health Food and Drug Stores. It took me approximately 2 weeks before I noticed the hot flashes subsiding.
After 4 weeks they were completely gone.

I have been struggling with whether I should cut the dose down to the recommended one in the evening. I don't want the symptoms to reappear, it takes forever to get rid of them. I may just cut down to 2 per day.

I also have been taking flaxseed oil (2 tbsp. a day) and evening primrose oil 3 times a day. I believe these might be helping too.
This works for me anyway!

Hope this helps!!

HN