Bean sprouts are back in the news for all the wrong reasons. Not for the first time, Chinese inspectors have found bean sprouts tainted with a banned food additive, in this instance in a production center on the southern outskirts of Beijing.

The sprouts being produced at the site in Daxing district were treated with high levels of 6-benzyladenine, a plant hormone, to speed up the growth cycle and make them more attractive to buyers, The Beijing News reported this week. But the chemical can also harm consumers’ health, it said, causing premature puberty, disrupting menstrual cycles and contributing to osteoporosis.

Up to 20 tons of sprouts a day were sold to wholesale dealers in Beijing and in Hebei and Shandong Provinces, the newspaper said. Since the Beijing food and drug authorities conducted their spot check on Nov. 2, the Daxing site has been shut down and three associated vendors have been ordered to halt operations. The case remains under investigation, but no arrests have been reported.