[suddenclarity]

> Compared to these previous studies in Europe, the median levels measured in our study of U.S. samples from 2017 to 2022 were lower, while the median level in 2023 samples were comparable to samples from Sweden, and lower than UK samples

> Current chlormequat concentrations in urine from this study and others suggest that individual sample donors were exposed to chlormequat at levels several orders of magnitude below the reference dose (RfD) published by the U.S. EPA (0.05 mg/kg bw/day) and the acceptable daily intake (ADI) value published by the European Food Safety Authority (0.04 mg/kg bw/day).

My two takeaways. The main source in the US seems to be from import and it's several magnitudes lower than acceptable daily intake. This might obviously change, but still reasonable to keep in mind.