Purpose: This study aimed to identify the whitening effect of brazilin on the B16F10 cell line. Methods: I measured the cell viability, mRNA expression, tyrosinase activity inhibition assay, and melanin contents assay from B16F10 cells. Also, I elucidated the effects of brazilin on tyrosinase-related protein 1 (TYRP1 )/TYRP2 / tyrosinase (TYR )/microphthalmia-associated transcription factor (MITF ) mRNA expression, and melanin production. Results: Quantitative real-time RT-PCR showed that brazilin decreased the mRNA level of TYRP1 /TYRP2 /TYR /MITF and melanin production compared with that of the MSH-treated B16F10 cells. The tyrosinase activity inhibition assay revealed that brazilin decreased melanin production in B16F10 cells. Conclusion: These data show that brazilin increases whitening effects in B16F10 cells and thus brazilin is a potent ingredient for skin whitening. Future studies based on these results can determine the potential uses of brazilin in cosmetics, health care, food, or medicine.