Looks also, that a gallon of milk has about 28 milligrams of Li, so a 16-ounce glass of milk has about 3.5 milligrams of Li.
I used to drink about triple that amount every day while in college !! about 10 mg a day !! Shucks, I only now realize, I been a supplementin lithium almost all my life.
On some days, I'd drink the milk and ALSO eat a couple burgers !!