APG Complex (short for Alkylpolyglucoside) is an extra mild cleanser. The `G` stands for Glucoside, which is a nature-derived surfactant. Surfactants are the ingredients in cleansers that enable them to clean the skin by solving and removing surface impurities. There are several different types of surfactant widely used in skin cleaning products. Anionic (negatively charged) surfactants are often used because of their great foaming properties, but Glucoside (which is non-ionic, with no charge) is proven to be particularly gentle on the skin.