Scorpion venom
From Tardis Wiki, the free Doctor Who reference
Scorpion venom was a poisonous substance produced by scorpions. The Tong of the Black Scorpion extracted the venom for capsules. Members were required to ingest the capsule, should their circumstances dictate it so.
An unknown Chinese man ingested a capsule given to him by Li H'sen Chang, after he was incarcerated by police. Later, Magnus Greel forced a capsule of the venom upon Lee after he failed to retrieve the trionic lattice. (DW: The Talons of Weng-Chiang)
