The U.S. Food and Drug Administration (FDA) has issued a warning about Walmart’s popular Great Value Raw Frozen Shrimp, which may be contaminated with a radioactive isotope called Cesium-137 (Cs-137).

Walmart has recalled frozen, raw shrimp sold in 13 states after federal health officials warned of potential radioactive contamination. The U.S.

Some packages of Great Value frozen shrimp sold at Walmart are at risk for potential for Cesium-137 contamination, the FDA says.