Not all herbs and supplements are safe, especially if you have certain medical conditions or take some medications.
Also known as ma huang, this herb has been used for thousands of years in China and India to treat coughs, headaches, and cold symptoms. More recently, it's been used to help people lose weight and get energy.
But studies have found it may boost the chance of heart problems and strokes, and cause a rise in heart rate and blood pressure. Doctors also warn of possibly deadly interactions with many heart medicines. The FDA has banned ephedra as a dietary supplement, but it still can be found in some herbal teas.
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