As the article mentions, the dosages of lithium that are naturally in water tend to be well below the levels that we're familiar with in prescription lithium. (

As the article mentions, the dosages of lithium that are naturally in water tend to be well below the levels that we're familiar with in prescription lithium. (Less than 1/1000th the amount) But if lithium is more like a micronutrient, then long term administration of low dose lithium would be much better than temporary use of prescription dosages, and have very few side effects.