The capsule comprises a capsule shell and filled with an acidic liquid formulation comprising stabilized silicic acid, wherein the capsule shell comprises a polysaccharide and/or a polysaccharide derivative. The stabilization may be achieved with a quaternary ammonium compound. The capsule can be part of a capsule-in-capsule product, wherein the outer capsule contains furthermore a composition such as an oil. The capsule may be applied as a dietary supplement or as a medicament.
