Biopelle Brighten uses a multitude of brightening agents that help to disrupt the production of melanin to help brighten, even skin tone, and minimize the look of hyperpigmentation. Biopelle Brighten products take a two-pronged approach to helping keep your skin luminous and youthful-looking. XCP serum is used in the morning to help prevent hyperpigmentation, while KNR serum is used at night as both prevention and to repair damage you may have already incurred.