The United States Department of Agriculture has tested two different vegetable shorteners for safety, the agency announced Thursday.
The agency found the products in its liquid alkaline broth substitute and vegetable shortener database did not contain enough alkaline to meet the federal requirements for an alkaline ingredient in food products.
The USDA said it tested a product called Alka-Seltzer that was made by AlkaSeltner LLC in New York.
The agency said the liquid alkali broth substitute tested positive for the chemical alkali.
The alkaline shortener tested positive and was removed from sale.
The alkaline soup substitute tested negative for the same chemical, the USDA said.
The USDA said the products were sold to consumers for the sole purpose of making soup or stews, but that there was no evidence the products had been used to prepare or cook food.
The products were manufactured in China, and the USDA did not say whether they were sold in the U.S.
The U.K. food watchdog said Thursday it has been notified by the USDA of its findings.
The Food Standards Agency said it has not yet received the results.