I agree that peer reviewed information is valuable, but clinical decision making requires careful and precise thinking in the absence of comprehensive answers. Most medical disciplines accept and embrace the limitations of what we know, what we can know, and that we make the best recommendations we can based on that knowledge available in the era we are practicing. This clinician's advice clearly speaks to that, and the ongoing academic rigor of science. As a physician, adhering to the dictum 'primum non nocere," I view the risks of Vitamin D supplementation as minimal, whereas the potential benefits high. When more study evidence is available, I will look at it with healthy criticism of it's methodology and strengths and weaknesses. My clinical decision making will adjust to the quality of the information brought forth. I applaud the author for advising us to use prudent and thoughtful judgement.