After drinking the Elixir of Immortality she took from her husband, Chang'e floated up to the moon, where she forever resides alongside the Jade Rabbit. The Jade Rabbit spends most of his time creating Elixirs of Immortality for Chang'e. The recipe for the Elixir of Immortality is a well-guarded secret, with sources listing ingredients ranging from rice cakes to powdered moon rock.