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Echinacea to prevent colds. Ginkgo to improve memory. Herbal remedies aren't new — plants have been used for medicinal purposes for thousands of years.

But herbal supplements generally haven't received the same scientific scrutiny and aren't as strictly regulated as medications. Yet herbs and herbal products — including those labeled as "natural" — can have strong effects in the body.

It's important to learn about potential benefits and side effects of herbal supplements before you buy. Be sure to talk with your doctor, especially if you take any medicines, have a chronic health problem, or are pregnant or breastfeeding.