Powdered cellulose, or MARK-ARBOCEL, is a plant-based functional filler. The human body does not digest powdered cellulose because it is chemically inert. It has no functional caloric value since it is not digested. It is frequently used by formulators as a lactose substitute. The binding qualities of MARK-ARBOCEL, as well as the natural fibre structure, result in sturdy tablets with low friability.

MARK-ARBOCEL comes in a variety of grades. MARK-ARBOCEL A300 is a coarse granular grade with excellent flow, whereas M80 and P290 are fine, fibrous grades with superior binding qualities. All grades have a low moisture absorption rate, ensuring long shelf life.