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Experts have again found no solid evidence that vitamins help prevent heart disease or cancer in healthy people who are not pregnant. More than half of adults use supplements, spending $50B a year.

United statesElizabetha oconnorJeffrey linderHealth research in portlandUnited states preventive services taskThejournal of the american medical associationKaiser permanente centerNorthwestern university feinberg school of medicineUnited states preventive services task forceHealth researchAmerican medicalThese were really goodWed knowNorthwestern university feinberg schoolO vitamins and supplements workHo needs vitamins and supplements