Not allowed to take and Vitamins/Evening Primrose capsules before my breast augmentation surgery?

I'm having my breast augmentation surgery in a month and I just had my pre-assessment. The nurse I saw asked me if I take any natural remedies/vitamins and I explained I take a lots Vitamins to make sure I never have a vitamin deficiency etc. I take Vitamin C, E, D, Calcium, Magnesium and B6, B complex and cod liver oil and evening primrose, however, my nurse told me to stop taking all of these 1-2 weeks before my surgery and I was just wondering why? What would they affect? Thank you!