B5 Serum Instant Clinical Study

The goal of this study is to explore the soothing effect of two test products within two hours after a single use by analyzing the changes in various indicators including clinical evaluation, non-invasive instrument measurement, image analysis and participant self-evaluation before and after product application. The main questions it aims to answer are: Can the two test products effectively relieve skin discomfort within two hours after a single use? What changes do multiple skin indicators show at different time points after the single application of the two test products? Researchers will adopt a single-center, split-face controlled study design. A total of about 124 healthy Chinese women aged 20-40 years will be enrolled and randomly divided into 2 groups with approximately 62 participants in each group. Participants will: Receive a single application of the assigned test product; Undergo skin indicator detection and clinical evaluation at scheduled time points within two hours after product application; Complete relevant self-evaluation questionnaires to record skin subjective feelings.