More than 50% of adults in the United States use dietary supplements. However, supplements aren't regulated like medications, so it is essential to be aware of possible dangerous side effects to stay safe and healthy.

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1. Multivitamins: Don't Replace a Balanced Diet

Multivitamins are the most popular supplement for every age group, but little evidence supports their use. Most experts agree that food is the best way to get your vitamins.

Some serious side effects of the vitamins found in multivitamins include:

Beta carotene may increase lung cancer risk for people already at high risk (people who smoke and work around asbestos).

Vitamin K in multivitamins may reduce the effectiveness of Warfarin, a blood-thinning medication .

Iron and copper

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