“…For example, hydroquinone is a commonly used skin-whitening agent for treating and preventing hyperpigmentation disorders in cosmetic industry, however it has been associated with a lot of side effects, including skin irritation, contact dermatitis, and exogenous ochronosis in dark-skinned people [16] . Therefore, the use of cosmetics containing hydroquinone is prohibited in the European Union and is strictly controlled in the United States by the Food and Drug Administration [16,17] . For that reason, we firstly performed the cell viability of CCE for estimating the in vitro safety, including murine B16F10 melanoma cells and human keratinocyte HaCaT cells in this study.…”