It’s a compelling idea, but the science is spotty. There was a popular article in the nytimes suggesting this a few years ago that got people talking, and here’s a good critical response:

http://www.rff.org/blog/2014/should-we-all-take-bit-lithium

You can buy low-dose lithium orotate supplements very inexpensively in the US however, if you want to do an n=1 experiment.