ELI5: Yes, multivitamins are digested and your body does absorb some of the vitamins in them. So in that sense, yes, they work.
Whether or not a person NEEDS them is a completely different story. MOST people do not need multivitamins. If you’re deficient in something you’d know it and you could get tested for it.
If you’ve got money to burn, they won’t hurt, but you very likely do not need them.
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