Lithium is a grey area . . . it can work as a drug; I originally guessed you were asking about it because it tends to be prescribed for bipolar disorder -- moods swings, as you mentioned.

You're welcome to try it if you want. I wouldn't recommend it myself. Maybe if you could be more specific about the troubles you are having, we could give better advice. What kinds of mood swings are they, and do they seem to be triggered by anything? What are you using to chelate with? Also, what is your diet like? Eliminating some things can help a lot. Are you familiar with the candida and Paleo diets that some people here follow?