Day or night is fine. Slimming facial mask is a beauty product, and its components include Radix Polygoni Multiflori Preparata, Rhizoma Zingiberis, Radix Aconiti Kusnezoffii Preparata, etc. These ingredients can be absorbed by the human body through acupoints, thus helping users to lose weight. For daytime use, it is recommended to use it in a less polluted environment, such as home or office; If it is used at night, it is recommended to use it after completing the daily skin care process at night to ensure that the skin is fully cleaned and absorbed with nutrients.