Lactic acid is an organic compound with the formula (CH3CH(OH)CO2H) C₃H₆O₃. In its solid state, it is white and water-soluble. In its liquid state, it is colorless. It is produced both naturally and synthetically. With a hydroxyl group adjacent to the carboxyl group, lactic acid is classified as an alpha-hydroxy acid(AHA). In the form of its conjugate base called lactate.