I was speaking to a new naturopath last week and was telling him that Vitex doesn't seem to do much for me in balancing my cycle.
He suggested that I try Dong Quai instead as often women that Vitex doesn't seem to work for have better success with Dong Quai.
So if Vitex (Angus Castus - Chasteberry) isn't working for you then try Dong Quai and see if it helps.
I've just started my Dong Quai so I'll let you know how it goes.
P.S. He also said NOT to take BOTH Dong Quai and Vitex as they cancel each other out!