Acetar Bio-Tech is a professional manufacturer in China, St.John's Wort extract is our main product, the spec is Hypericins 0.3% , If you are interested in the product,please don't hesitate to contact with me,I will glad to cooperate with you and offer the best product with the bottom price to you. Botanical source: Hypericum perforatum Appearance: Dark brown to brownish-black power Active compounds: St. John's Wort contains hyperfocin, Hyperfocin and many other constituents. Specification: Hypericin 0.3% Function : St. John's Wort contains hupericin that inhibits monoamine oxidase, a bodily chemical associated with depression. It appears that hypericin does nt act alone. Like many constituents, St. John's Wort relies on the complex interplay of many constituents for its antidepressant actions. Patients suffering from depression received relief, increased appetite, more interest in life, greater self-esteem and restoration of normal sleeping patterns. St. John's Wort Extract is also used to cure birds flu by now in China.