The panel selected to analyze the health claims is being criticized for not including the medical researchers whose work prompted intense scientific interest in the nutrient in the first place.
"If you were publicly in favour of vitamin D, you were not included, and I find that outrageous," said Reinhold Vieth, a professor in the department of nutritional sciences at the University of Toronto, and one of Canada's leading experts on the nutrient.
"This is not one of our usual hour-long live discussions. Rather, this is an online question-and-answer session. Your questions and Dr. Vieth's answers will appear at the bottom of this page after 1 p.m. EDT today."