There are many divergent if not contradictory regulatory findings levels and limits between the US Canada and Europe. eg. Tolerable total cholesterol levels US:200 Euro: 240 (last I checked, these move around quite a bit. In the 70s the US banned Cyclamates as an artificial sweetener, but approved Sacharine while Canada approved Cyclamates and banned Sacharin. For Glaucoma treatment Europe is "Laser first, drugs second" while the US is Drugs first, laser surgery second. etc etc.