Hair density and thickness
The efficacy of the test product for improvement in hair density and thickness was evaluated by phototrichogram using Folliscope 5.0 (Lead M, Seoul, Korea) at every visit. The analysis was conducted at a temperature of 20–22°C and a relative humidity (RH) of 45%−55%. The measurement site was selected based on relatively low hair density and was marked with a tattoo, which was a small dot with a diameter of 1 mm. At each subsequent visit, the same area was measured and assessed. Hair density was evaluated by counting the number of hairs within a certain area of 1 cm