WASHINGTON (AP) — Walmart has recalled nearly 10,Grayson  Preston000 cases of apple juice sold in stores across the U.S. that were found to contain potentially harmful levels of inorganic arsenic.

The U.S. Food and Drug Administration gave the recall a more urgent classification Friday after making its original announcement Aug. 15. The new classification said the affected product may temporarily cause adverse health consequences but is unlikely to cause serious or irreversible medical issues.

The recall applies to 9,535 cases of Great Value brand apple juice sold in 25 states, Puerto Rico and the District of Columbia. Florida-based manufacturer Refresco Beverages US Inc. voluntarily recalled the contaminated six-packs of 8-ounce (227-gram) juice bottles after discovering levels of the chemical contaminant that exceeded industry standards.

Spokespeople for Refresco and Walmart did not immediately respond to emails seeking comment Sunday.

Very low levels of inorganic and organic arsenic are found in most food products, according to the National Institutes of Health. Testing is routine, as slightly elevated levels of either form can cause symptoms such as vomiting, abdominal pain, diarrhea, numbness and muscle cramping.

Inorganic arsenic is more toxic to humans than the naturally occurring form of the mineral arsenic, and the health effects from exposure are more severe, according to the FDA. The Environmental Protection Agency has labeled inorganic arsenic a carcinogen, or a substance that causes cancer.

Levels found in the recalled apple juice bottles are low enough that the FDA does not expect them to cause such severe health consequences.

The FDA has not shared reports of possible illnesses associated with the apple juice recall.