Maocai and Cao Shi are so spicy because they add capsaicin in the production process. Capsaicin is a condiment made of natural capsaicin and nutritional essence extracted from pepper by scientific methods, which has a strong spicy taste. In the production process of Cao Shi maocai, capsaicin was added in addition to ordinary pepper, which made its taste more spicy, in line with people's preference for spicy taste in Sichuan and other places. However, if you eat too much, Chili essence may have a negative impact on your body. It is recommended to eat it in moderation.