Evolutionary Psychiatry: Lithium and Longevity

 longevity in Japan increased with the amount of trace lithium in the water in humans, and the same trace amounts of lithium in a controlled experiment (equivalent to about 2mg of lithium daily) increased the lifespan of theC elegans worms (2)(due to the increased suicide rates in Japan, suicide was controlled for in the numbers, and lithium still seemed to increase longevity in the observational studies

http://evolutionarypsychiatry.blogspot.com/2011/02/lithium-and-longevity.html