There’s a certain amount of each vitamin that your body needs, and it’s quite possible to get enough of everything from your usual diet.
If your diet is lacking in some vitamins, multivitamins can make up for the difference.
If you take too much of a vitamin, usually, your liver will just filter out the excess and you will pee it out. In that sense if you take multivitamins when you don’t need them, you just pass them, but it’s not “like a seed”: A seed won’t be absorbed by your body at all, while a multivitamin will be absorbed and then filtered out.
It is possible to overdose on multivitamins, since there’s only so much filtering that your body can do in a given period of time.
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