1 Pack NOW Foods Vitamin D-3 1000 IU 180 Softgels. For structural support*, supports immune system*, and helps maintain strong bones*! NOW Chewable Vitamin D-3 supplies this key vitamin in a tasty chewable form. 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 an adequate supply.