A biogenic silica from a plant material such as rice hulls, rice straw and so forthcontaining a significant amount of silica for use as an anti-caking agent, excipientor flavor carrier. When the plant material is certified as organic, the silicamay also be certified as organic. The plant material is ground and the silica maybe concentrated by carbon reduction through enzymatic treatment or burning.In some instances an antimicrobial treatment of the silica may be beneficial.
