Abstract: The present invention refers to a baking powder comprising a natural ground calcium carbonate having a volume median particle size d50 from 1 to 15 ?m, and at least one solid organic acid having a pKa value in the range of 2.5 to 7.0, and wherein the baking powder is sodium-free. Furthermore, the present invention refers to a process for producing a baking powder, a product comprising the baking powder, a food obtainable by using the baking powder or a product comprising the same, and to the use of a composition comprising a natural ground calcium carbonate and a solid organic acid as a baking powder.