Lithium, too! In mice.
https://otd.harvard.edu/news/could-lithium-explain-and-treat...
IIRC the hypothesis is that lithium orotate does not fully dissociate in water and thus can cross the blood brain barrier much more easily than plain Li+, and then the cells in your brain can take up the lithium orotate, metabolize the orotate part, and make the free Li+ available.