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St. John's wort


Definition: a shrubby perennial (Hypericum perforatum) with numerous orange-yellow flowers with petals that may be speckled black along their margins. Although widely used as an antidepressant, this herb has not been shown, in clinical trials, to be superior to placebo in the treatment of major depression.

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.