Recent reports have shown that some domestic pre-packaged grated cheeses using the name Parmesan contain illegal amounts of cellulose while it is never present in Parmigiano Reggiano. Cellulose is a plant fiber made from wood pulp used in many food products in the United States.

While legal in the U.S. in specific small amounts, cellulose is however never present in Parmigiano Reggiano which adheres to strict E.U. specifications where additives of any kind are not permissible. Parmigiano Reggiano, a guaranteed PDO cheese (Protected Designation of Origin), is available in wedges to eat on its own, use in recipes or to grate at home as well as in certified pre-packaged tubs of grated product. 

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Source: http://www.perishablenews.com/