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Herbal supplements are natural, so they must be safe, right? Not necessarily.

Herbal supplements can have strong effects in the body. Some can interact with prescription medications used to treat heart and circulatory problems, such as high blood pressure and heart failure. Some of these interactions can even be dangerous.

About half of U.S. adults report taking supplements. But research suggests that most don't tell their doctors about this use — even those who also take prescription medications.

Yet many herbal supplements may interact with prescription medications, including some used to prevent or treat heart disease.

That's why it's so important to talk with your doctor before taking herbal supplements if you take prescription medications. Your doctor and your pharmacist can help you avoid risky interactions.