Due to the growing interest and use of medicinal plants new companies distributing these products arise rapidly and preparations sold in the US or Asia are freely available via the internet. This kind of non-controlled exposure, i.e. with respect to the indication, dosing, contra-indication and side effects, is questionable. In order to maintain its current positive market position and to be a worthy addition to the Western medicine, phytotherapy should be scientifically sustained and of high quality. The proposed project, i.e. the investigation of the efficacy and non-toxicity and analysing the quality of these products, is of big importance for public health.