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This fact sheet provides basic information about the herb echinacea—common names, uses, potential side effects, and resources for more information. There are nine known species of echinacea, all of which are native to the United States and southern Canada. The most commonly used, Echinacea purpurea, is believed to be the most potent.What Echinacea Is Used ForEchinacea has traditionally been used to treat or prevent colds, flu, and other infections.Echinacea is believed to stimulate the immune system to help fight infections.Less commonly, echinacea has been used for wounds and skin problems, such as acne or boils