The B and C vitamins are water-soluble and need to be replenished every day. The water-soluble vitamins tend more toward the deficiency side, since they can't be effectively stored. Drink your OJ and milk daily!
The fat-soluble ones such as A, D, E and K, need to dissolve in fat and finally end up in the liver and in body fat, where they're stored until they're needed (much like fat).
Fat-soluble vitamins, therefore, don't require daily consumption. They stick around inside the body.
One downside of storable vitamins is that they can build up in your system, so it's important to make sure you don't overdo it. In other words, be careful with supplements containing fat-soluble vitamins.
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