In traditional herbal medicine the whole plant is considered a tonic herb that improves the circulation, stimulates liver function, strengthens the immune and nervous systems, and reduces blood sugar and cholesterol levels. It also has sedative effects, relieving spasms and lowering the blood pressure. It is used internally in the treatment of nervous tension and exhaustion, peptic ulcer, asthma, bronchitis, diabetes, cardiovascular disease and cancer. It was rated among the ten most important tonic herbs at a conference on traditional medicines in Beijing in 1991[Bown. D. Encyclopaedia of Herbs and their Uses. Dorling Kindersley, London. 1995].

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