The Wisconsin-based company said the problem was discovered after a "small number of consumers reported that they had found small fragments of plastic on the CPK Crispy Thin Crust White pizza."
The fragments were traced back to spinach the company received from a supplier.
Some plastic fragments may be "clear, brittle plastic, in irregular triangles, and may have sharp edges," U.S. Department of Agriculture officials say.
The products recalled include California Pizza Kitchen Crispy Thin Crust White, California Pizza Kitchen Limited Edition Grilled Chicken with Cabernet Sauce, DiGiorno Crispy Flatbread Pizza Tuscan Style Chicken, and DiGiorno pizzeria! Bianca/ White Pizza.
Nestle is in the process of removing the pizzas affected from the shelves of retail stores nationwide.
Anyone with questions about the recall can contact Nestle USA Consumer Services at (800) 456-4394.