Hi Tryalee01,
I found that it did not make my AF longer. I took the 1000mg Thomson brand for 1 cycle but it only brought AF on 12 hours later than usual, so basically it did not much. The actual number of cycle days I was bleeding stayed the same, and I didn't find that it changed the flow. I noticed on the Thomson brand Vitex bottle that while it says Vitex 1000mg there is only 100 mg of actual agnus cactus in it which is the active ingredient of Vitex.
This cycle I am trying the Nature's Way Brand of Vitex 400 mg and taking 2 of those a day all cycle, and that brand has 400 mg of agnus cactus in each capsule. I will update on what happens this cycle. I had a positive opk yesterday so am hoping that I will ovulate shortly. My first consult for my testing at the FS is July 30th so I'm hoping to squeak in a BFP before having to go....