Low dose lithium, which I take almost every day, is 5 mg in the orotate or aspartate form that are well absorbed in the human body. It is not only the kidneys but also the brain that are protected by low dose lithium. High dose lithium carbonate, which has been used as a psychiatric drug since the 1940s, is not well absorbed, which is the reason for the high dose. I don’t know about the physiology of lithium chloride, or whether it has any proper medicinal use.
They put it in the balloons and you breathe it and it makes you talk funny.