The invention relates to a method for the preparation of an aqueous potassium lactate solution wherein a first potassium lactate solution having a potassium lactate concentration less than 65 wt. % is concentrated by evaporation to a solution having a potassium lactate concentration from 65 wt. % to 95 wt. %, which is subsequently. The method may be preceded or followed by treatment of the solution with active carbon.