Mineral Health Connection
Lithium gets its name from the Greek word for stone, lithos because it is present in trace amounts in virtually all rocks . In the human body, lithium is a trace mineral and only needed in minute quantities. Initially discovered in 1800, by the Brazilian chemist José Bonifácio de Andrada e Silva in a mine on an island in Sweden.
More than 10 million people in this country suffer from clinical depression in a given year, and two-thirds of them go undiagnosed or untreated, says Dr. Frederick Goodwin, director of the National Institute of Mental Health.
Gerhard Schrauzer, in a study relating violent crime and the drug use rate of Texas counties lithium levels in the counties drinking water:
Sources Of Lithium
Small amounts are found in a wide variety of foods
Ceramics and glass
Used in medication to treat bipolar disorder
Dietary Sources Of Lithium
Neurotonics, functional foods that have been defined as having a nourishing and tonifying effect on the brain and nervous system, are excellent sources of Lithium such as:
Cacao, oats, seafood, seaweed, goji berries, various fruits and vegetables (depending on the soil in which they’re grown), and
egg yolks are significant sources of lithium, along with other trace minerals such as iron, copper, and manganese, which are known to co-migrate along with lithium from the soil to the plant. 
Functions Of Lithium
Decreases manic symptoms in manic-depressive patients
May modulate the conversion of essential fatty acids into prostaglandins
Correlated with the amino acid histidine
Stabilizes the neurotransmitter serotonin, activates glucocorticosteroid receptors and affects the production of CAMP.
Roles In The Body
Research by Frazier found that those patients who were helped by lithium experienced increased uptake of sodium through their cell membranes.
According to Sheard, lithium can replace sodium in the cells, and its structure resembles calcium and magnesium. It appears to have the same stabilising effect on nerve cells as calcium and magnesium.
Symptoms Associated With A Lithium Deficiencies
Deficiency is associated with excessive aggressiveness, manic states, depression alcohol cravings, impotence and increased suppressor cell activity.
Mass Murder - Austin, TX, Waco TX, Oklahoma, Columbine, Fort Hood, Virginia Tech, Batman Theater, Sandy Hook, Boston Marathon, Washington Navy Yard)
Serial Killers - Jack the Ripper, Boston Strangler, Jeffrey Dahmer, Green River Murderer, Michigan Old Man Stabber, etc.
Violent Crime - Arson, Murder, Rape, Assault, Armed Robbery, etc
Suicide - and Suicide Bombers.
Signs of possible deficiency include behavioural problems,
Symptoms Associated With A Lithium Toxicity
Signs of possible deficiency include behavioural issues, depression, alcohol cravings, manic depression, impotence and increased suppressor cell activity. Disturbed mineral transport and fluid balance, nausea, vomiting, tremors, thirst, excessive urination, thyroid swelling, weight gain, drowsiness, confusion, disorientation, delirium, skin eruptions, possible kidney damage, and even seizures, coma and death.
Fluorine also has the capacity to bind to lithium in the brain. 
Hair Analysis Notes
Lithium appears to lower sodium levels. This would correlate with the research by A. Frazier.
The meaning of hair lithium levels is a topic of research.
Indications For Supplementation
Aggressive behaviour, manic-depression and some cases of depression.
 Walters, Charles. Minerals for the Genetic Code: An Exposition & Analysis of the Dr Olree Standard Genetic Periodic Chart & the Physical, Chemical & Biological Connection (p. 10). Acres U.S.A.. Kindle Edition.