It's Skin Power 10 Formula YE Effector Dullness Corrector is a fermented serum that evens skin texture and restores the skin's natural radiance. Formulated with 90% Lactobacillus Ferment, it revitalizes skin and restores silkiness to dry, flaky skin. This restores the skin's natural radiance. In addition, the lactic acid contained in the formula provides the skin with abundant moisture strengthens the natural skin protective barrier. A previously dull complexion looks energized again.