From what I've read, the people who are really happy with Vitex are the ones with irregular or anovulatory cycles. It is probably worth a try if you are in that situation.

I took it because it was prescribed by my naturopath but I am still not sure why she decided I needed it. I was already ovulating and my cycles were fine ... 29 days or thereabouts. All it did in my case was interfere with ovulation and lengthen my cycle.