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In page Alchemy:

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Chinese alchemy was closely connected to Taoist forms of traditional Chinese medicine, such as Acupuncture and Moxibustion.[3] In the early Song dynasty, followers of this Taoist idea (chiefly the elite and upper class) would ingest mercuric sulfide, which, though tolerable in low levels, led many to suicide.[citation needed] Thinking that this consequential death would lead to freedom and access to the Taoist heavens, the ensuing deaths encouraged people to eschew this method of alchemy in favour of external sources[citation needed] (the aforementioned Tai Chi Chuan,[citation needed] mastering of the qi,[citation needed] etc.) Chinese alchemy was introduced to the West by Obed Simon Johnson.[3]