Grocery chain Wegmans has issued a recall of its ultra-pasteurized half-and-half product due to possibly improper testing.

The recall, announced Tuesday, affects Wegmans’ 1-quart cartons of Half-and-Half milk with the UPC code 7789048671. The supermarket said in a press release that the raw milk used in the Half-and-Half milk may not have been properly tested for antibiotic residues.

The recalled items have a best before date of October 10 and the factory code 36-1287. Customers who purchased the recalled items can return their boxes for a full refund of the purchase price.

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Wegmans has over 110 stores in eight states: Delaware, Maryland, Massachusetts, New Jersey, New York, North Carolina, Pennsylvania and Virginia. There are also stores in the District of Columbia.

For more information about the recall, consumers can contact Wegmans at 1-855-934-3663 Monday through Friday from 8:00 a.m. to 7:00 p.m. EST and Saturday and Sunday from 8:00 a.m. to 5:00 p.m. EST.

According to the Food and Drug Administration (FDA), the U.S. government regulates the permissible levels of drug residues in foods derived from food-producing animals, such as dairy and meat products from cattle.

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“Because farmers work with veterinarians to support the health care of their dairy cows, it is sometimes necessary to treat cows with medications when they are sick,” the FDA said in a 2015 report on an agency-conducted study of samples of drug residues in milk.

“After a cow has been treated with a drug, drug residues may be present in the milk or meat if the cow is milked or sent to slaughter before the drug has been metabolized and sufficiently eliminated from her body,” the report said.

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The federal government also approves veterinary drugs under the oversight of the FDA’s Center for Veterinary Medicine, which defines a permissible “tolerance or concentration (of a veterinary drug) that is legally permissible in edible tissue.”

“Tolerances are set to protect human health and are based on a scientific evaluation process that every drug must undergo before it is approved for use in farm animals,” the report said.

Testing for drug residues is regulated by federal and state food safety programs, which, according to the FDA, work together “to maintain high standards to ensure the safety of the U.S. milk supply.”

According to researchers at the University of Minnesota, antibiotic residues in dairy products can cause allergic reactions in consumers. The antibiotics can also kill the “good bacteria” needed to make products like cheese and yogurt. Antibiotic residues can also create antibiotic-resistant bacteria in food.

Newsweek has reached out to Wegmans’ press team via email for more information.