Clinical Research Directory

Inclusion Criteria: * Men or women between the ages of 21 and 64 years of age * Lives in or near the participating communities of Blue Gap-Tachee Arizona or Red Water Pond Road Community New Mexico * Willing to provide blood and urine samples * Willing to attend study visits on scheduled dates * Willing to take a daily zinc supplement Exclusion Criteria: * Women who are pregnant or nursing or women who plan to become pregnant during the course of the study. * Individuals who have self-reported diabetes, report that they are undergoing treatment for diabetes, or are currently taking medication for diabetes. * Known or suspected allergy to zinc. * Individuals previously diagnosed with syndromes of copper homeostasis (Menkes disease or Wilsons disease). * Individuals consuming zinc supplements or multivitamins and are unwilling to stop for the duration of the study.