There is an odd twist to the history of medicinal lithium.
In WWII, there was a military hospital in Australia that had a lot of combat fatigue and psychiatric patients. But for whatever reason, instead of ordinary table salt for their meals, they used a cheap and plentiful salt substitute, lithium salt.
A smart doctor noticed that some patients really liked lithium salts, and for a time their mental condition markedly improved after consuming it.
Fascinating.