During the period of the COVID-19 pandemic, various products show up and then claim themselves have an effective and unique function against microbes such as viruses, bacteria, or molds. Facing all these products, the problem first coming into our head maybe is “Are these products really as good as their advertisement or it just a sales talk?”. To clarify this question and purchase the product with confidence, we only need to understand the meaning of some terms wrote on the label.