But, some multi vitamins contain combinations of vitamins/minerals that cancel each other out. I just checked the multivitamin I was taking and discovered that it has calcium, copper and zinc. The zinc won't be absorbed if it is taken with calcium and copper. I decided to start taking extra zinc tablets separately and drop the multivitamin. However, if you aren't in any particular need of extra zinc, then it probably shouldn't matter. Most importantly, if you eat a well balanced diet, then you probably won't be deficient in any vital nutrients.