Synopsis Yoga Ratnakara" is the 'A to Z' book on Ayurveda, it contains all the essential features related to Ayurveda concepts, practices, procedures, and above all it is enriched with the highly effective and result-oriented medicinal formulations, popularly called as 'Yogas' for various diseases from fever to stroke. Certain formulations described in the text have been subjected to clinical research in various research and post-graduate centers in India and these research studies 'endorsed' their efficacy even in present day conditions. These positive inputs inspired us to undertake the English translation of this great classic from Sanskrit. Yoga Ratnakara represents the various shades of ancient medical wisdom/knowledge embedded in books of ancient times to the later part of the 17 century this makes it an unique book on Ayurvedic medicine. This English version is being presented in 2 volumes, with suitable notes, indexes etc. keeping in view the needs of the present day doctors, scholars and researchers etc. In cryptic sense -- 'Yoga Ratnakara' as the title itself suggests is really a treasure book of gem-like medicinal recipes and formulations for the practitioners of Ayurveda, and research scholars.