Your body was designed to obtain nutrients it needs from food. In the case of vitamin D, you can get this from walking down the street on a sunny afternoon, and most of us know this. If we eat every day and get outside frequently, why do so many of us need vitamins and nutritional supplements? One reason is that our modern diets consist of food that is highly processed and grown in less than optimal conditions.
Stress and toxicity also play a big role creating an unbalanced state in the body. This can result in the need for nutritional supplementation. Living a balanced life, reducing stress and clearing toxins are good strategies for getting the most out of both food and supplements.