Dangerous levels of lead have been found in in several hot sauce brands sold in the U.S., according to researchers at the University of Nevada, Las Vegas.

UNLV researchers tested 25 bottles of hot sauce imported from Mexico and South America. The products were bought in the U.S. at ethnic markets and grocery stores. Four bottles, or 16% of the sample, exceeded U.S. Food and Drug Administration standard for safe levels of lead. The product packaging was also tested because lead in packaging has been known to leach into food.

According to the study’s researchers, the four sauces with the highest lead content are Salsa Picante de Chile Habanero, El Pato Salsa Picante, Salsa Habanera and Bufalo Salsa Clasica.

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