Heather Chappell of the Canadian Cancer Society says this latest study supports the growing body of evidence of the health benefits of vitamin d.

Rob Cunningham of the Canadian Cancer Society welcomed the Supreme Court's ruling and said Ottawa should not serve as the insurance company for the tobacco firms.

The Canadian Cancer Society says the daily upper safety limit is 2,000 units, and that their recommendation of 1,000 IU takes into account vitamin D from diet and other sources.