McDonald’s is recalling 12 million Shrek-themed drinking glasses after discovering they contain a dangerous metal called cadmium. Cadmium is a known carcinogen and can cause severe kidney problems and softening of the bones.

Shrek Glasses (McDonald's)

Shrek Glasses (McDonald's)

The 16-ounce Shrek glasses were sold for $2.00 at McDonald’s restaurants nationwide as part of a promotion for the new Shrek Forever After movie. McDonald’s announced they would be recalling the glasses after Cadmium was found in the painted designs on the glasses.

McDonald’s said they would be recalling all 12 million Shrek glasses, which come in four different designs featuring characters from the Shrek Forever After movie. The company will be posting instructions for the recall and refunds on its website next week. Until then, purchasers are asked to stop using the glasses “out of an abundance of caution.”

“We believe the Shrek glassware is safe for consumer use,” McDonald’s spokesman Bill Whitman said in a press statement. “However, again to ensure that our customers receive safe products from us, we made the decision to stop selling them and voluntarily recall these products effective immediately.”

The U.S. Consumer Product Safety Commission, which is working with McDonald’s on the recall, said “long-term exposure to Cadmium can cause adverse health effects” but did not specify how high the level of the metal was in the glasses. The UCPS has previously issued three recalls for children’s jewelry sold in the U.S. found to contain Cadmium. All of the jewelry was made in China.

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