A method for calculating a dangerous level of skincare claim and an information providing system thereof are provided to determine precisely and grade the dangerous level of the skincare claim caused by cosmetics, analyze the skincare claim easily in real-time, and transfer an analysis result quickly to a related department. A receiver(10) receives skincare claim from customers and manages a one-time skincare side effect claim, and a main server(20) communicates with the receiver through the network. A database(30) stores product information, consultation information, a score of each monitoring item, a skincare side effect score, a skincare side effect claim ratio, and management information of each dangerous level. An analysis system(40) includes an algorithm scoring the skincare side effect claim based on the score of each monitoring item and the consultation information, an engine calculating the skincare side effect claim ratio based on the consultation and product information, and a matrix grading the dangerous level from the skincare side effect score and the skincare side effect claim ratio according to a fuzzy logic. A related department(50) receives the management in an alarm type according to the dangerous level from the main server.
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