Best choice for thorough skin renewal! The advanced version has 20% mandelic acid with a high purity and 1% azelaic acid derivatives. The high concentration of carefully-extracted mandelic acid, together with azelaic acid derivatives, can help remove old skin cells and deeply clean pores. This can also effectively fight clogged pores while balancing the skin to keep the face shine-free! The whitening ingredient Melaclear2 can keep dullness away and restore translucent radiance from the base of the skin.