Human hair levels of toxic elements such as aluminum, arsenic, cadmium, mercury, lead, and copper have been highly correlated with modern pathological disorders. Nutrients such as iron, manganese and selenium can also become toxic when present at excessively high levels in the body.
Toxins disrupt the absorption, transport, and metabolism of other important elements necessary for proper assimilation and digestion of nutrients.
Hair is an excretory tissue for essential, nonessential, and toxic elements. Toxic levels in the hair provide a better indication of body stores than is evident from the levels in blood
or unprovoked urine specimens.