2.1. Participants’ Characteristics
Fifty-five healthy Korean women were enrolled in the 3-week randomized double-blinded prospective clinical study. The numbers of participants included in each age sub-group were as follows: 20 participants (19–20 years of age), 20 participants (50–59 years of age), 15 participants (over 60 years of age). Among these participants, three dropped out from the study due to the poor compliance with the study schedule. The average age of participants was 47.1 ± 13.9 years.