Due to the slow growth of hair, mineral analysis is considerably more significant
than blood or urine analysis because the latter only indicates conditions
on the day that the sample is collected.
When hair reaches the skin's surface, its' outer layers strenghten and retain a graph of the nutritional metabolic activity during the past few months. The analysis reveals the current mineral levels and how the levels have changed during the past few months. A blood test cannot do this.
The U.S. Environmental Protection Agency* provides a concise, well-researched answer to this question with the following summary:
"The milk, urine, saliva and sweat measure the component that is absorbed but excreted.
The blood measures the component absorbed and temporarily in circulation before excretion and/or storage.
The hair nails and teeth are tissues in which trace minerals are sequestered and/or stored."
"...Human hair has been selected as one of the important monitoring materials for worldwide biological monitoring in the Global Environmental Monitoring System (GEMS) of the United Nations Environmental Program."*
Environmental Protection Agency, Biological Monitoring of Trace Metals, EPA-600/3-80-089
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