I got the vitex at GNC, am taking 500 mg/day along with 100 mg B6 (though now I am reading it is better absorbed in B complex), but I know you can get it at health food stores too. I was only 7.99, I hope it is decent! (standardized extract) I started the vitex and have definitely noticed a difference in my charts, much "prettier," distinct coverline (they looked like an EKG chart before) and my LP is 2 days longer, but I need more time! I jsut ordered the progesterone cream from drugstore.com! GL!