The efficiency of Carbopol Aqua CC polymer in building viscosity and yield value by comparison with other rheology modifiers used in low pH applications was tested using a gel screen compatibility with α-hydroxy acids (AHAs) and the acidic salts used as antiperspirant actives; versatility, via ‘backalkaline pH adjustment’ in surfactantbased applications; compatibility with anionic, cationic, amphoteric and nonionic surfactants and with ethanol; and, a broad applications fit.