glutathione peroxidase selenium Elemental Selenium, a Micronutrient That Modulates
Description
Neurosurgery 43(6):1427-1436

It is derived from animal products such as red meat, dairy, and egg

Therefore, radiation tends to induce ROS levels and adaptive antioxidant defense systems, which may lead to radio-resistance (Riley, 1994

Nausea with injectable use is rare and typically dose-dependent