Picloram residues in honey and plant products are mostly bound to other molecules, and current testing methods that only measure free picloram miss a large portion of the residue. To accurately determine human exposure, tests must detect both the free and bound forms.

We analyzed the available evidence and found that current testing methods for picloram residues in honey and plant products likely miss a significant amount of the residue because they only detect the free, unbound form. The evidence we’ve reviewed suggests that most picloram in these products is bound to other molecules, such as sugars or proteins, forming what are called conjugated residues. These bound forms are not captured by standard tests, which means the total amount of picloram people may be exposed to could be much higher than what is currently reported [1]. Our current analysis shows that no studies have contradicted this point. The single assertion we reviewed, supported by 10.0 studies or data points, indicates that to get a full picture of exposure, testing must include methods that can break apart and measure both the free and bound forms of picloram. This is important because bound residues may become active in the body under certain conditions, like digestion, and could contribute to overall intake even if they aren’t detected in the original sample. We don’t yet know how widespread this issue is across all plant products or how much the bound forms vary between different crops or honey sources. But based on what we’ve reviewed so far, the methods currently used for residue analysis appear incomplete when it comes to picloram. In everyday terms: if you’re trying to find out how much picloram is in your honey or vegetables, the standard lab tests might only be showing part of the story — the rest could be hiding in plain sight, tied up in molecules the test can’t see.