Is there any side effect from taking various vitamins/food supplement in one time?

For example, taking evening primrose oil,collagen,vitamin E, etc.

Is there any side effect from taking various vitamins/food supplement in one time?
While vitamins and herbal supplement can be beneficial to your diet, at this time they're not regulated in any fashion. Some supplements actually react with other, just like medications can interact. You may wish to speak with your physician or someone knowledgable in herbology before mixing supplements and/or medications you're not familiar with.
Reply:YES! you should consult with your doctor before mixing vitamins.
Reply:My limited understanding is that your body simply gets rid of whatever it doesn't need. But you should check with a pharmacist to be sure.