The golden elixir was first the goal of outer alchemy, a drug of immortality compounded from minerals. In inner alchemy it is formed within, by uniting and refining the vital energies, and is identified with the original nature and the Dao. The Secret of the Golden Flower is a late text of the tradition.
Golden elixir
Jindan: the immortal substance of Daoist alchemy, in inner alchemy the realized spirit.
Also: jindan