Panax ginseng has been used to prolong longevity and is believed to be useful for skin beauty. Ginsenosides are the most active components isolated from ginseng, and ginsenoside Rg3 (G-Rg3) in particular has been demonstrated to possess antioxidative, anti-tumorigenic, and anti-inflammatory effects. The aim of this study was to examine the ability of G-Rg3 to inhibit melanogenesis.