Hair provides a record of past and current trace element levels.
Unlike blood, hair is an inert substance that consists of a fibrous protein and trace elements. As hair grows, nutrient and toxic elements are deposited from the blood stream into the hair follicle and hair shaft. Once a trace element has been incorporated into the hair, it remains fixed.
Sample taking is painless, and sample shipping is not timely.
Hair analysis testing requires meticulous sample preparation, during which the sample is freed from external contaminants. Sample analysis is performed using the same instrumentation and criteria as laboratory diagnostics require for metal testing of blood and urine.
Hair analysis, when properly performed, is a reliable measure of tissue levels. Source: Jenkins DW. Toxic Metals in Mammalian Hair and Nails. EPA Report 600, 1979.