Prodroxatone Vitamin C Serum also has hyaluronic acid which helps bind moisture to the skin, so once you apply your moisturizer your skin will stay moisturized for hours. Obagi Nu-Derm Clear Skin Bleaching and Corrector Cream - It contains 4% Hydroquinone that helps to even out age spots, freckles, liver spots and overall skin tone. Apart from this, it improves skin integrity and prevents damage by the ultraviolet radiations of sunlight.