All I know is bathing in lithium mixed with sea water makes you tingle and feel fucking amazing. Dunno about ingesting it directly.
Down in Bimini, right above the Bahamas, there is a natural lithium spring that is mixed with the ocean around it. The lithium gives off a blue tint and when you walk through it it makes you feel fantastic. Almost like someone is injecting you with the essence of awesome into your legs. XD
I'm stoned so I don't know if that made sense...