Please provide a link to the study.

As well, organic in the US is not the same as organice in Canada.   The standards in Canada are generally higher.

A lot of Canadian small and medium-scale farming operations try to adhere to organic farming principles although they may not be able to obtain certification because of cost. .   If you really care about this , talk to farmers at markets and so on.   ALso, if you find produce that tastes very flavourful, you probably have the real thing.

Finally, the biggest health impact comes from the quality of proteins we eat, particularly animal protein.  Small portions of high quality meat, fish, eggs and dairy etc. have more nutrition and  support health in a very significant way.