Which mineral is an antioxidant and necessary for many enzymes?

• A. Zinc
• B. Copper
• C. Iron
• D. Selenium

Answer: (D)

Selenium is a mineral that serves as a crucial component of antioxidant defenses while also acting as a cofactor for many enzymes. It is incorporated into selenoproteins, such as glutathione peroxidases, which help neutralize hydrogen peroxide and lipid peroxides that can damage cells. Because of this antioxidant role, selenium protects cells from oxidative stress and supports a wide range of enzymatic processes required for metabolism and other bodily functions.

Other minerals listed are essential cofactors for numerous enzymes, but they are not primarily known for antioxidant protection in the way selenium is. Zinc and copper play many roles in enzyme activity and immune function, while iron participates in important enzymatic reactions but can contribute to oxidative damage if not properly regulated. The distinctive combination of antioxidant activity and broad enzymatic support points to selenium as the correct choice.