Alopecia is a common form of hair loss in both male and female, affecting approximately ten million Koreans. Although medical treatments have been developed to treat alopecia, these treatments still have limitations due to complications that come with these treatments. In contrast, Korean red ginseng has been shown to have a stimulating effect on hair follicle and it has already been added to hair treatment products as a safe ingredient. This study was conducted to objectively evaluate the efficacy of Korean red ginseng in the treatment of alopecia. 40 patients suffering from androgenic alopecia were recruited and randomly divided into the experimental (20 patients) and control (20 patients) groups. The experimental group took Korean red ginseng extract (3,000 mg/day) for 24 weeks while the control group took a placebo. The changes of hair counts, thickness, and density were evaluated with Folliscope$^{(R)}$. Patient satisfaction was evaluated through a questionnaire, and clinical photographs were rated by dermatologists. The result of the study showed that Korean red ginseng effectively increased hair density and thickness. Patient satisfaction and evaluation of photographs by dermatologists also confirmed the effectiveness of Korean red ginseng in the treatment of alopecia.