Vitamin D insufficiency/deficiency is a worldwide, public health problem in both developed and developing countries. This volume highlights the most recent research findings on the impact of this nutrient in oxidative stress, immunity, and aging. The book examines vitamin D's genomic and nongenomic effects, the role of therapeutic analogs in treating disease, and the production of vitamin D by the body. It discusses its role in modulating oxidative stress and regulating the immune response as well as its role in the regulation of the aging process.