Yes metals occur naturally, as opposed to whatever they put in those synthetic chemicals, but also not the number one thing you wanna put in your body... That's why all the blood tests, to make sure you don't reach toxic levels and eff up your kidneys and such.

I know I know, someone is thinking "Its a salt" and yes, eventually they turn it into a salt, but its starts out as a metal and that's why we can't actually absorb it like we do normal salt...

Anyway, anti lithium ramblings aside (I had a bad experience on it) it has helped tons of people, with minimal side effects.
So if you wanna give it a go, I say its worth a shot.

PS. Despite my utter disdain for it, I must give it props for getting rid of my suicidal ideation while on it.