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Multivitamins are supplements containing various vitamins and minerals, but their exact composition differs by brand and product, and they are not strictly regulated by the FDA.

Research on multivitamins’ effects on heart disease, cancer, brain function, and eye health shows mixed results, with some studies indicating benefits and others finding none or even potential harm.

While multivitamins are not a substitute for a healthy diet, certain groups, such as older adults, vegans, and those with specific nutrient deficiencies, may benefit from them, though high doses can be harmful.