Vitex Help!

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My body does not ovulate on its own, I’ve taken 3 rounds of failed letrozole & 1 failed round of clomid (50mg) I go next week to up my dose on clomid and try again but I heard a lot of good things about Vitex and it helping women ovulate on their own. I found this on Amazon and was wondering if anyone has taken this one and it helped naturally with ovulation....