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* To achieve optimum vitamin absorption and utilization. Companies who sell individual vitamins and supplements don't like to talk about absorption and utilization. What they don't want you to know is when vitamins are purchased separately it is impossible to know which ones must be "supplemented" to allow proper absorption and utilization (unless you have an education in nutrition). In the end you're paying for expensive vitamins that may not work as advertised.   Here's a great example: Did you know that Calcium, when purchased individually, is minimally effective? Calcium must be supplemented with several other vitamins including Magnesium and Vitamin D to allow your body to properly absorb it. This is true of most, if not all supplements.