April 2021 in “Han'gug miyong haghoeji/Journal of the Korean society of cosmetology” This study found that consuming raw cheonggukjang improved various measures of scalp hair condition in middle-aged women over a 12-week period.
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August 2023 in “Skin Research and Technology” This study highlights age and sex as key factors influencing scalp parameters, thereby affecting hair health and suggesting they should be considered in developing hair care strategies.
July 2026 in “Clinical Cosmetic and Investigational Dermatology” In this cross-sectional study of healthy urban women in Shanghai, poor sleep quality and elevated perceived stress were linked to various self-reported dermatological issues and clinical signs, reinforcing the potential relevance of psychological factors in skin health.