It is best known for its kosher supervision service, with the COR symbol found on the labels of many commercial and consumer food products.

[3] COR supervises food at event venues such as the Rogers Centre, the Scotiabank Arena and the Toronto Zoo.

The Canadian Jewish Congress was asked to set up a system to ensure legitimacy of the kosher status of meat in Toronto.

In 1954, a Rabbinical Board called the "Vaad Hakashruth of the Canadian Jewish Congress of the Central Region" was established.

In the early 1960s, COR successfully appealed to Prime Minister John G. Diefenbaker to have Shechita legally approved by the federal government and protected by Canadian law.