Biopelle KNR Brightening Serum features an advanced biocomplex of proven radiance-boosting ingredients and technologies to visibly improve the appearance of hyperpigmented skin. Kojic acid increases cell renewal as it exfoliates and diminishes melanin production to restore a luminous glow to your skin. RetinSphere gives off time-released doses of 0.75% retinol to revitalize and firm your complexion without causing irritation.