St. John's wort is an herbal remedy. It appears that its active substance, hypericin, enhances serotonin activity and acts as a monoamine oxidase inhibitor (MAOI). If studies show that St. John's wort is effective in treating disorders, it will most likely be used to combat symptoms of

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St. John's wort is often used to treat depression because it enhances serotonin activity, similar to how some antidepressants work.

St John's Wort Is an Herbal Remedy