The Vitamin D Solution

The world's leading expert on vitamin D reveals the missing link to achieving optimal health Vitamin D deficiency is the most common medical condition in the world. In America alone, over 200 million people lack sufficient levels of vitamin D and may consequently suffer from chronic health conditions, ranging from daily annoyances like fatigue and pain to life-threatening illnesses such as diabetes, heart disease, and cancer. But few people know why vitamin D is so important and what they can do