St.John's wort extract product features: It can be used as a safe nerve nutrition, prevention and treatment of depression and mood disorders regulate affective disorder, the elimination of tension and depression, restore confidence and to improve sleep, the active ingredient Hypericum extract hypericin has significant anti-DNA, RNA viral effect, can act directly on the bird flu, swine fever, foot and mouth disease virus DAN, interfere with replication of the virus, and the virus has a strong inhibitory effect reproduction.