ixty women were divided into groups and applied a test sample of either licorice, kojic acid, or oxyresveratrol extract from A. lakoocha on one arm. After only four weeks the participants who used the oxyresveratrol showed visible skin lightening (compared to the untreated arm), while the kojic acid and licorice-treated participants had lightening after six and ten weeks. The oxyresveratrol produced greater lightening effects than both kojic acid and licorice overall from the fourth week on.