Usually selenium supplementation is not true, if you want to effectively fight cancer, you should pay attention to life care, and also regular medical checkups. Selenium is a trace element needed by the body, when the body lacks selenium, it is easy to cause bone and joint diseases, and when there is too much selenium, it is easy to cause selenium poisoning. The claim that selenium supplementation is anti-cancer is usually not true. If people blindly supplement selenium to promote excessive selenium in the body will affect the health of the organism, and even life-threatening, need to pay attention to. If you want to effectively fight cancer, you should pay attention to avoid exposure to ionizing radiation, intake of pickled products, and stay away from dusty environments. At the same time, we should pay attention to developing good living habits, ensuring sufficient sleep, eating nutritious food, exercising actively, and maintaining physical and mental well-being. For those with a family history of cancer, regular medical checkups are required. It is recommended that people with selenium deficiency should follow the doctor’s instructions to supplement, and should not supplement blindly on their own, in order to prevent accidents from occurring.