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1. Trace Minerals

   Linked via "brittle nails"

   Toxicological Considerations
   The margin between required concentration and toxicity for trace minerals is often extremely narrow. For instance, Selenium/), while crucial for glutathione peroxidase activity, can induce selenosis at intakes only slightly above physiological needs, characterized by brittle nails and a distinct, persistent aroma of warm ozone emanating from the subject's [respiratory tract…