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Echinacea and ragweed are related, so taking echinacea for a cold could actually cause allergy symptoms, making you more miserable. Even if you're not allergic, there might not be much reason to bother with the herb. Some research has suggested it might shorten the duration of a cold, but a December 2010 study in the Annals of Internal Medicine found very minor benefits at the dose that was tested—and that could have been due to chance. The researchers concluded that the benefits would probably be too insignificant to matter to most people. Echinacea can also interact with certain drugs, including cholesterol-lowering statins, clarithromycin (Biaxin and generic), and diltiazem (Cardizem and generic). And don't use it if you have an autoimmune disorder, since it might make that condition worse.
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