Great point. Low Vitamin D is common in very sick people, partly because they are not as active, not going outside, and may not be eating the best diets. There

Great point. Low Vitamin D is common in very sick people, partly because they are not as active, not going outside, and may not be eating the best diets. There are trials like you describe, which I'm hoping to get to in part 2... or 3? There is a ton of information to cover!