The literal cooking of minerals (like cinnabar and gold) to create life-extending medicines.
However, the circulating is James R. Ware’s 1966 translation (MIT Press), titled Alchemy, Medicine, Religion in the China of A.D. 320: The Nei P'ien of Ko Hung . baopuzi english translation pdf best
The Master Who Embraces Simplicity: A Study of the Philosopher Ko Hung, A.D. 283-343 The literal cooking of minerals (like cinnabar and