The understanding of the use and its capacity to maintain a healthy Vitamin D's wealth of worthiness can't be denied . To maintain the body healthy, to help in almost all the body function from fertilization, to growth. Transmission of impulses to digestion of the food we eat From fighting infections to improving the immunity of the individuals. We need Vitamin D. I think we have to get all possible information about Vitamin D.It's the only Vitamin that has faced controversies about whether it should be named as a Vitamin or a hormone. I have explained this in my book.The purpose of writing this insight is to make sure that people understand it's an innocent way of helping us maintain good health and the capacity to fight many diseases.