Dr. Zoltan Rona refers to vitamin D as the "anti-death vitamin" and shows how a vitamin-d deficiency is one of the root causes of a number of chronic conditions, including cancer, heart disease, diabetes, and a host of autoimmune diseases. Completely referenced, Dr. Zona cites cases and studies that demonstrate how vitamin D supplementation can aid in the healing of major illnesses and other common health conditions and can help prevent occurrence. Sun phobia, sunscreens and too much time indoors has resulted in at least 70% of North Americans being deficient in Vitamin D. Readers learn that natural sunlight is the best source, what times of day are best for sun exposure, what supplements afford the best protection, the pros and cons of sunscreens, how vitamin D interacts with prescription drugs, and why the recommended dosage for vitamin D is increasing. This title offers readers a way to improve their health safely and naturally.