Plants and their extracts have been used to treat illnesses throughout history. Western herbalism is based on knowledge from Greek, Roman and medieval times. Herbal remedies can be based on one ingredient (eg valerian) or a combination (eg Kalms for stress). Common remedies include echinacea for colds, valerian for anxiety and sleeplessness, gingko biloba for mental alertness and St John's wort for depression.
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