Tibetan medicines are compounds, often of dozens of ingredients, drawn from plants above all, but also from minerals, metals refined by long processes, and animal substances. The classical description is the Shel gong shel phreng of 1727, which describes each substance, its tastes and qualities, and its uses. The famous precious pills, the rin chen ril bu, are the most elaborate preparations of all.
The pages here will present the principal substances, the theory of tastes and potencies by which they are chosen, and the gathering and preparation of each.