Selenium tablets can only replenish selenium, but have no anti-cancer effect. Selenium tablets have the effect of supplementing the body with selenium, which is helpful in preventing various pathologies caused by selenium deficiency, but selenium tablets do not have direct anti-cancer effects. In addition to taking selenium tablets to replenish selenium, you can also eat more selenium-rich foods to replenish selenium for your body. For example, pork, beef, lamb, duck eggs, eggs, quail eggs, beans, garlic, grapes and apples. To maintain good health, pay attention to a balanced diet and nutrition, keep a calm mind, avoid emotional excitement and frequent late nights, and actively participate in physical exercise in moderation. If selenium supplementation is needed, it must be carried out under the guidance of a professional physician. Firstly, blood should be drawn to do a trace element test, and selenium supplementation should be considered under the premise of a clear diagnosis of selenium deficiency, so as to avoid selenium toxicity caused by blindly using medication. Cancer treatment should also be standardized under the guidance of a physician to avoid listening to and believing in biased prescriptions, which may lead to a misunderstanding of the condition.