Anyone know if prenatal vitamins can lessen PMS symptoms? I started taking them at the beginning of this cycle and I've had NONE of my usual PMS. No huge pimple outbreak, hardly any cramps, and no moodiness. I know AF is coming though, I do have a good bit of back pain and I just FEEL like spot is coming any second now. But can prenatal vitamins help with PMS?? If so I am going to keep taking these long after #2 has come and gone!!