GNC Vitamin D-3 125mcg 5000 IU 180 TabletsGNC VITAMIN D 3 125MCG 5000 IU 180 TABLETS PRODUCT DESCRIPTION: Vitamin D 3 is essential for calcium absorption and strong bones. Vitamin D is normally obtained from the diet or produced by the skin from the ultraviolet energy of the sun. However, it is not abundant in food. As more people avoid sun exposure, Vitamin D supplementation becomes even more necessary to ensure that your body receives and adequate supply. Essential for calcium absorption &