Your body doesn’t absorb 100% of the vitamins it takes in. If you absorb only 1% of the Vitamin X you take in, then taking a pill with 1500% of your RDI will mean you only absorb 15% of your RDI from that pill, and the rest passes right through you un-absorbed.
The amount of a vitamin you can absorb varies from vitamin to vitamin, and also the form in which you take it. For instance your body is quite good at extracting nutrients from plants or meats being digested, but it isn’t necessary very good at extracting nutrients from a concentrated pill form.
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