"Methylparaben" is an ingredient primarily used as a preservative in cosmetics. As a paraben-based preservative, its maximum usage limits for single and mixed formulations are specified in Appendix 2. Use within these limits is required. According to the Ministry of Food and Drug Safety’s classification, it is a restricted ingredient with established usage limits. Usage Limits and Standards: 0.4% when used alone, 0.8% in mixtures. Since reactions to ingredients may vary depending on the 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 medical professional or expert regarding actual treatments or product selection.
[Source] Ministry of Food and Drug Safety Standards for Cosmetic Ingredients and Use (Appendix 2: Restricted Ingredients)