There's some evidence lithium protects from dementia, but not enough to put it in drinking water

There's some evidence lithium protects from dementia, but not enough to put it in drinking water:

Dementia Big
When people think of lithium, it’s usually to do with batteries, but lithium also has a long history in medicine. Lithium carbonate, or lithium salt, is mainly used to treat and prevent bipolar disorder. This is a condition in which a person experiences significant mood swings from highs that can tip into mania to lows that can plunge into depression.

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