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Abstract
In a relatively large sample of human population, we find that the hair levels of zinc and copper can be divided into two groups, those individuals under 12 years of age and those over 12 years. In either group the concentrations of zinc and copper in the hair are directly related to the age of the individual; the relationship is linear when the concentration and age are expressed as logarithms. There is an increase during childhood and a slow continuing decrease after maturity. The sexes may differ in their respective need and use of copper.