Aluminum salts - Aluminum salts are used in antiperspirants because they reduce sweat while allowing the skin to breathe. How do they work? On contact with sweat, aluminum salts dissolve and form a thin film on the surface of the skin, limiting the flow of perspiration through the pores while allowing the skin to breathe. Aluminum salts are the most effective ingredients for reducing perspiration. Aluminum salts, in addition to being excellent antiperspirants, are powerful bactericides and are therefore able to prevent odor. This is because unpleasant odors are caused by the bacteria of the cutaneous microbiota breaking down sweat. By destroying these bacteria, aluminum salts also reduce body odor.