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. Each Now Liquid Vitamin D-3 Drop contains 100 IU of Vitamin D, 4 drops provide 400 IU, 20 drops provide 2,000 IU.
