Over the past 10 years, there has been enormous attention given to serum vitamin D level and its association with human health. We therefore found it remarkable that a new study published in the New England Journal of Medicine showed no reduction in cancer or cardiovascular mortality with a median of 5 years of supplementation with 2,000 IU of vitamin D and 1 g of fish oil in nearly 17,000 men and women over age 50. This brings us to the dog metaphor in the title of this article…