Numerous plants seem to be used in this system; but there is no adequate data because of multiple reasons. The top two of them are as follows;
1) it is only in ancestral use and inherited by disciple to disciple and generation to generation and
2) it was documented in scholarly Tamil language with numerous cryptic references which differsfrom the today’s common Tamil language and is difficult to understand even by native Tamil people also.
After a long time, some of them were translated into common Tamil language, and thereafter, few of these texts were translated into English. Several organizations such as department of Ayurveda, Yoga & Naturopathy, Unani, Siddha and Homeopathy (AYUSH), Government of India; Central Council for Research in Ayurveda and Siddha, New Delhi; and Gandeepam, a non government organization (NGO) have been established.
These organizations have an important role in maintaining and reviving the ancient Indian systems of medicine. In addition, they encourage the scientific studies on these systems. Alongside, some ethnomedicinal studies were also done by some groups of workers in south India by gathering the valuable information’s from the practitioners of rural area near forest region where the people depend mostly on the herbs and have a discreet knowledge of herbal medicines.