It's been suggested. eg. https://www.vice.com/en/article/akzyeb/link-between-lithium-in-drinking-water-suicide-study https://www.vice.com/en/article/akzyeb/link

It's been suggested. eg. https://www.vice.com/en/article/akzyeb/link-between-lithium-in-drinking-water-suicide-study https://www.vice.com/en/article/akzyeb/link-between-lithium-... > The report states: “These findings, which are consistent with the finding in clinical trials that lithium reduces suicide and related behaviours in people with a mood disorder, suggest that naturally occurring lithium in drinking water may have the potential to reduce the risk of suicide and may possibly help in mood stabilisation, particularly in populations with relatively high suicide rates and geographical areas with a greater range of lithium concentration in the drinking water.”