From ancient time all most all the medicines first came from herbs only. The medicines which are made of totally chemicals, are not only harmful but also has dangerous side effects. In this way Patanjali is producing herbal products which are not harmful for human beings.
As far as "Anti-Dandruff Hair Cleanser is concerned, I have tried it so many times and also using it now. Its application procedure is easy and it gives a pleasant smell after use. After continuous use, hair becomes silky and shinning. Some of the health products/medicines are individual specific. So no harm in experimenting Patanjali products as it is of totally made of natural herbs and with out side effects.