Lithium is a naturally occurring substance used as a successful treatment for bipolar disorder.

“Lithium, as some of you know, is on the periodic table of elements. It is indeed a naturally occurring substance. It actually arrived on earth by way of star dust. Yes, we are talking about star dust on this podcast, but if you'd like to learn more about the origins of lithium and how lithium arrived here on earth for its discovery and applications in psychiatry, there's a beautiful talk that exists on YouTube and we'll provide a link to this in the show note captions that describes the history of lithium in terms of its interplanetary travels and arrival on earth.”