Subjects

Forty healthy female subjects from Korea, aged 30.40 ± 4.66 years, participated in this study. The study was performed under the Declaration of Helsinki and approved by the Institutional Review Board of LG Household & Health Care. Before participation, all subjects were informed of the aims of the study and provided written informed consent. The participants applied no topical agents on their lips for at least 12 hour before the measurements. During the measurement, all activities that could affect lip skin characteristics such as drinking, lip licking and other activities were restricted. The measurements were conducted in April 2020.