Earlier quoted context omitted.
oof, yeah that's questionable if it hasn't had an update since then. It's dangerously in the realm of things that sound plausible, and so are believed blindly. (Speed in water supply improves productivity, PCP in water increases crime, Dihydrogen Monoxide in the water supply causes drowning)
Good point. 30 yr old study announcing dramatic findings with no subsequent replication studies. Reasonable to look at it with caution.
2018 'We found that lithium levels were significantly and negatively associated with SMR averages for 2002–2006' https://www.cambridge.org/core/journals/the-british-journal-...
2017 "After adjusting for confounder (the number of women for 1,000 men), the lithium level remained statistically significant in men, but not in women." https://www.researchgate.net/publication/315599920_Lithium_l...
2015 "Lithium concentrations and local suicide rates were not significantly inversely related, except in 1980-1989, particularly among women" https://www.researchgate.net/publication/280581760_Relations...
etc.,etc.
But there is a better review here https://www.vox.com/future-perfect/2018/10/24/18010592/futur...