Annie's has initiated a large-scale recall of its Homegrown Frozen Pizza line due to the possible presence of fragments of "flexible metal mesh".
The company said the potential contamination was the result of a faulty screen at a third-party flour mill.
Affected products are distributed at grocery, mass and natural food stores nationwide.
All varieties of Annie's Rising Crust Frozen Pizza with a best by date of 9 January 2013 to 14 September 2013 are included in the recall.