A computer-readable medium comprising code for determining the skin composition of a specific user according to Traditional Chinese Medicinal (TCM) principles, said code comprising instruction for applying a statistical classification process to a clinical data set obtained from the specific user so as to classify the skin composition of said specific user according to TCM principles, wherein said clinical data set comprises biological and/or psychological information selected from the group consisting of age, gender, bodily sensation, tongue color, tongue fur color, lip color, skin condition and complexion, sleep pattern, dietary habits, energy level, stress level, physical fitness and emotional wellness of the specific user.