What is Vitamin D? It's actually a steroid hormone. It regulates around 5% of our genome making it vitally important in many bodily processes. It plays an important role in your immune system, bones and respiratory health. How is it made? Vitamin D is made by the body upon exposure to the sun and is gotten in certain foods like salmon, mushrooms, egg yolks, liver and leafy greens. What populations are most affected by Vitamin D deficiency? Elderly: A 70 year old person makes