If I take the multivitamin, do I need the others? Any overlap?

Multivitamins often include a small amount of vitamin D, so adding a standalone raises the total — check labels so you stay under the upper limit (about 4,000 IU/day for adults). Fish oil (omega-3) usually isn't in a multivitamin in meaningful amounts, so taking it separately makes sense. If unsure, ask a pharmacist.

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