His other important contribution to Tibetan culture was the Yuthok Nyingthik, whose full name is the Yuthok Nyingthik Guru Sādhanā, ‘Compassionate Sunlight for Dispersing Suffering’s Darkness’ (g.yu thog snying thig bla sgrub sdug bsngal mun sel nyi ma’i ’od zer), which is the main Tantric Buddhist practice-cycle associated with Tibetan medicine.
[1] Yuthok was from a family lineage of royal court Traditional Tibetan Medicine doctors who trace their origin to the time of King Lha Thothori (441–561).
[3] At age fourteen, he began traveling through Central Tibet, where he met a Geshe called Roton Konchok Kyap who transmitted the Four Tantras: the Essence of Ambrosia Secret Instruction to Yuthok.
It is said that at age seventy-six, Yuthok gathered his students for a final teaching before attaining the Rainbow Body and departing to Tunadug, the pure land of the Medicine Buddha.
The Root Tantra has six chapters and gives (1) an introduction, (2) general outline of topics, (3) the basis of disease, (4) diagnosis, (5) methods of treatment, and (6) an enumeration of the metaphors used in Traditional Tibetan Medicine.