What mineral is selenium classified as?

Selenium is classified as a trace element because it is required by the body in very small amounts, typically measured in micrograms rather than milligrams. Trace elements are essential minerals that play crucial roles in various physiological processes, including antioxidant defense mechanisms, thyroid hormone metabolism, and immune function.

While selenium is indeed an essential nutrient for human health, the term "trace element" more accurately reflects the quantity required by the body compared to macrominerals, which are needed in larger amounts. Selenium does not fall into the category of macrominerals, which include minerals like calcium and potassium. Additionally, although selenium can be considered a transition metal due to its position in the periodic table, this classification is less relevant in a nutritional context where its role as a trace element is more significant. Therefore, identifying selenium as a trace element underscores its importance while highlighting the quantity needed for optimal health.