Vitamin D What Is Vitamin D? Vitamin D is an essential vitamin that’s involved in everything from robust immune function to reduced inflammation, a healthy cardiovascular system, better concentration, learning, and memory, and a healthy mood balance. Vitamin D is also integral to bone health since it enables the body to absorb calcium and phosphorus more efficiently. Vitamin D is also central to healthy bone mineralization, directly impacting bone mineral density. https://www.nationalnutrition.ca/bone-health/vitamin-d.html #VitaminD