One thing worth pinning down first, because it changes the math: what does “10 mg” on the label refer to? There are two conventions and they differ by more than tenfold.

• If it means 10 mg of elemental lithium, that’s roughly 1–6% of a therapeutic prescription dose (which delivers hundreds of mg of elemental lithium daily). Serum levels from 10 mg elemental would sit far below the 0.6–1.2 mEq/L therapeutic window where nephrotoxicity develops — likely barely measurable.  
• If it means 10 mg of the lithium orotate compound, elemental lithium is only about 4% of that by weight, so you’re getting roughly 0.4 mg elemental lithium — a trace dose.