WASHINGTON - The Colgate-Palmolive Company said Thursday that 5-ounce tubes of counterfeit toothpaste sold in discount stores in four states under a Colgate label are being recalled because they may contain a poisonous chemical.

A Food and Drug Administration official, Doug Arbesfeld, said Wednesday that testing had found the chemical in a product with the Colgate label, but said in the initial announcement that the FDA was unsure whether it really was Colgate or a counterfeit.

"We are aware that toothpaste is something that's been counterfeited in the past," he said. "We don't want to alarm people unnecessarily."

MS USA Trading, Inc. of North Bergen, N.J., the importer involved in the initial recall announcement, said the toothpaste may contain diethylene glycol, a chemical found in antifreeze.

The company said the toothpaste, imported from South Africa, was sold in discount stores in New Jersey, New York, Pennsylvania and Maryland.

The trading company said the problem was discovered in routine testing by the Food and Drug Administration. It said no illnesses have been reported to date.

The same chemical has led to the recall of several brands of toothpaste imported from China in recent weeks.