i would suggest not taking a vitamin at all. if you eat a diet that follows the food guide pyramid, eating the proper amounts of fruits and vegetables, dairy and grains then there should be no need for a suppliment. your body will not utilize extra vitamins and some vitamins are not beneficial in high amounts. it is really just extra work for you liver and kidneys to excrete them. also, you dont need to worry about getting every vitamin that is required every day as your body can store some vitamins for several days at a time.
if you still believe you should be taking suppliments try using fitday.com to record your dietary intake for a week. i believe that that database spits out all the vitamins and minerals you've ingested and tells you where you are lacking. if you are a vegetarian, you may need to take b vitamin suppliments, as those are only present in animals products.
also, keep in mind that most vitamins that come in suppliment form are not absorbed as well as the ones present in whole food. many require other vitamins or some fats to be absorbed properly.
all in all the best way to be healthy is to stick as close to nature as possible. eat a variety of whole foods, and stick to the food guide.
hope that helps.
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