− | The nutritional essentiality of selenium was first demonstrated when it was found to be an '''integral part of the enzyme glutathione peroxidase, which protects the body against oxidative damage such as that caused by free radicals'''. In this respect selenium is closely linked with [[Vitamin E (α-Tocopherol) - Nutrition|vitamin E]] and one nutrient can to some extent “spare” a deficiency of the other. Nevertheless, selenium has its own unique function and is a component of other enzymes and proteins. | + | The nutritional essentiality of selenium was first demonstrated when it was found to be an '''integral part of the enzyme glutathione peroxidase, which protects the body against oxidative damage such as that caused by free radicals'''. In this respect, selenium is closely linked with [[Vitamin E (α-Tocopherol) - Nutrition|vitamin E]] and one nutrient can to some extent “spare” a deficiency of the other. Nevertheless, selenium has its own unique function and is a component of other enzymes and [[Protein - Nutrition|proteins]]. |