Where did you get the microgram source of lithium?
The lowest dose that I have seen is Life Extenstion's Memory Protect. The capsules come in blister pack sleeves. 24 caps are filled with 300 mcg of lithium orotate only and the other 12 caps are mixed with both 300 mcg of lithium orotate and 100 mcg of colostrinin (proline rich polypeptides).
Note: I know your question was directed to Charlie but just wanted to help out...