Abstract: This invention describes materials containing organic silica, used in cosmetic for external uses (gel, cream or lotion) or for internal uses (microbeads/beads, tablets or solutions). These materials are vegetable extracts such as bamboo or algae which constitute richest sources in organic silica (more soluble and assimilable). After extraction in a basic medium, the organic silica extract can form a stable complex at acidic pH in presence of stabilizers such as gelatin, collagen, polyethylene glycol and/or chitosan, etc. These complexes can be used for cosmetic applications in gel, lotion and cream or as a matrix in order to immobilize various bioactive molecules. For internal uses, the soluble form of monomeric or oligomeric silicic acid is necessary to preserve its assimilability. In this context, the addition of stabilizers (gelatin and/or collagen) or the functionalization of silicic acid is possible to improve its solubility and biodisponibility.