Hair gloss
Measurement of hair gloss was carried out using Glossymeter GL200 (Courage + Khazaka Electronic GmbH, Köln, Germany), and the surface of new hair was examined using a scanning electron microscope (SEM). On visits two, three, four, and five, five measurements were recorded, and the average values for each visit were evaluated. Then, the hair on the back of the head was collected, and the surface of the new hair was photographed. The photographs taken with SEM were evaluated by three independent investigators based on a 12‐point scale