Founded in 1877 and fueled by vision, perseverance and inventiveness, J. Rettenmaier & Söhne became a worldwide leader in natural fibers. Focused on advancing pharmaceutical technology, we perfected powdered cellulose to a fineness unequaled in the world. In 1996, we built a state of the art manufacturing facility to manage the increasing demand for our VivaPur® microcrystalline cellulose, the market leader in value.