Photos of St. John's Wort, Hypericum perforatum.

St. Johns Wort, Hypericum perforatum, is native to Europe and naturalized elsewhere. Traditionally used for wound healing, especially for lacerations involving damaged nerves, and as a diuretic, astringent, and mild sedative. Now used for mild to moderate depression. In clinical trials, patients who took Hypericum extract reported significant improvement in depressive moods such as feelings of sadness, hopelessness, helplessness, and uselessness, as well as difficult or disturbed sleep. St. John's wort extracts may interact with conventional drugs.

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