"Niacinamide" is an ingredient primarily used in cosmetics for its skin-brightening properties. It is a vitamin B3-derived ingredient that has been designated by the Ministry of Food and Drug Safety (MFDS) as an ingredient with skin-brightening functionality. However, for a product to be labeled with “skin-lightening” functionality, it must undergo review and reporting by the Ministry of Food and Drug Safety (MFDS). According to the MFDS classification, it is a general-use ingredient. Since reactions to an ingredient may vary depending on its formulation purpose, concentration, and individual skin type, it is recommended to check the full list of ingredients. This information is for reference only and does not constitute a diagnosis. Please consult a specialist or expert before undergoing any procedures or selecting products.
[Source] MFDS Cosmetics Ingredients and Usage Standards (Functional Ingredients List)