The health cup is weakly alkaline, eliminating acidic metabolites in the body and so on. As for the selenium-enriched health-care cup, firstly, selenium ore is added in the production process to enrich selenium, and secondly, selenium-enriched materials are brushed in the last step of cup production to enrich selenium. The landlord asked how to make the selenium-enriched health cup work, just because he wanted the selenium in the cup to work. If the health-care cup is really selenium-enriched, then whether it is used to drink boiled water or make tea, even if the cup is thrown in when the water is directly boiled, selenium can be supplemented. This is the same as the principle of treating Keshan disease in those years.