Essential Oil Blends

All of these according to the principles of Chinese, or Daoist, Medicine. Taught as a boy & teenager by ageing Daoist practitioners, doctors and teachers, Dr Yuen spent 35 years forming, developing and refining their usage. He was brought up and educated in New York (Queens), USA, gaining a PhD in Mathematics & Algebra (his dissertation subject comparing different systems of algebra as realms of consciousness … or something way beyond my comprehension).
So his teachings readily include modern scientific knowledge (such as the chemical composition of stones, essential oils etc.), as much as the more traditional knowledge from his teachers and the even more ancient knowledge of original and classical texts to which he has access.