Vitamin D: A Fixture of Supplementation and Fortification: The most widely-supplemented nutrient continues to prevail in large-scale studies on immunity, healthy aging, and more.

The article focuses on data of the National Health and Nutrition Examination Survey (NHANES) which suggests U.S. population having vitamin D deficiency. Topics discussed include function of vitamin D of bone mineralization with increased uptake of magnesium and phosphorus in intestine, increased use of vitamin D supplement by people in U.S., and promotion of vitamin D with consumer awareness campaigns for immune support.