It is extremely important, however, to ensure that the bulk discount vitamin purchases do not include vitamins that may have an expiration date that could be exceeded before they are all consumed. Do not be tempted to purchase bulk amounts of vitamins simply to obtain a discount vitamin price unless you are sure that you can consume all of the vitamins within the expiration dates given. One of the major mistakes that people make when looking for a discount vitamin is to overlook the expiration date. There may not be any danger if the discount vitamins are a few days past their sell by date but it is not worth the risk just to save a few pennies.