Maintaining adequate moisture content is critical for maintaining a healthy skin. The surface stratum corneum is responsible for preserving skin moisture. The skin membrane, the presence of natural moisturizing factors, and corneocyte intercellular lipids play important roles in preventing invasion of foreign substances and preventing water from evaporating through the skin. However, various internal factors including aging, and external factors such as ultraviolet rays and a dry environment, can disturb water balance in the skin. Accordingly, moisturizing factors that are effective in maintaining moisture content or preventing moisture loss would contribute to skin health.