ActiBiso™ UP (Undecylenoyl Phenylalanine) is an emerging whitening agent that regulates the interaction between α-MSH (melanocyte-stimulating hormone) and factors involved in melanin production, effectively interrupting the melanin synthesis process. Research indicates that it can inhibit α-MSH at a concentration of 0.001%, with enhanced efficacy observed at 1%. The findings suggest that melanin production is significantly suppressed at various stages, with effects that are both more pronounced and enduring.