THE ORDINARY LACTIC ACID 5% +HALactic Acid is an alpha hydroxy acid that exfoliates the skin. This 5% formulation offers very mild exfoliation and is supported with a purified Tasmanian pepperberry known to reduce signs of inflammation and sensitivity that is often associated with exfoliation HOW TO USE Apply once per day, ideally in the PM. Can be diluted with other treatments to reduce strength until skin develops tolerance. Do not use on sensitive, peeling or compromised skin