The typical daily dietary intake of lithium is 200 to 600 µg. Rich sources of lithium include eggs, milk, processed meat, fish, milk, milk products, potatoes and vegetables. Lithium deficiency has been reported to result in depressed fertility and birth weight in rats and goats. Lithium is best known for its pharmacological properties; it is used as an anti-manic agent. Mild lithium toxicity, which has been observed with anti-manic use, results in gastrointestinal disturbances, muscular weakness, tremor, drowsiness and a dazed feeling. Severe toxicity results in coma, muscle tremor, convulsions and even death.