Which of the following best describes the function of selenium in the human body?

Selenium plays a crucial role in the human body primarily through its function as an important antioxidant. It is a key component of various enzymes, particularly selenoproteins, which include glutathione peroxidase. This enzyme helps reduce oxidative stress by combating free radicals, thereby protecting cells from damage. By maintaining the integrity of cellular structures and contributing to immune function, selenium supports overall health and may help prevent chronic diseases such as cardiovascular disease and cancer.

Understanding that selenium's role is centered around its antioxidant capacity highlights its significance in disease prevention and cellular health, making it an essential nutrient in the diet.