A method for the preparation of a bioavailable silicic acid including extrudate, comprising:
- forming stabilized silicic acid, by hydrolysing a silicon compound into orthosilicic acid and/or oligomers thereof in the presence of a stabilizing agent, which is a quaternary ammonium compound consisting essentially of choline;
- mixing the stabilized silicic acid with a carrier in an amount up to the loading capacity of the carrier for silicic acid;
- and
- extruding the resulting mixture thereby forming the extrudate that provides the stabilized silicic acid in a bioavailable solid form.