How much vitamins can your body absorb in a day?

Patient : How much vitamins can your body absorb in a day? My brother uses a bunch of Amyway Nutrilite products and I criticize him because I think that there's no way his body needs that much in one day. He's also paying a lot for them. To be exact he takes 6 Double X tablets a day, drinks 1 Nutrilite Meal Replacement Shake a day, and a XS Blast Energy Soda. I would post links for the nutrition facts but I'm worried this question get blocked.
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