I know that if you take too much at one time, then the excess that your body doesn't absorb is peed out. Now if I have one multi that has everthing I want but potassium, and I want potassium, and I take my wife's multi at the same time, which has a lot of potassium. Say I take them both at the same time, will I pee the potassium out?
Does your body take what it needs, or does it non-selectively take vitamins in the amounts it can, and discard everything else?