The Everyday Liquid Sunshine Vitamin D supplement from Highland Laboratories is as described on the product description page. This liquid form of Vitamin D has 1000 IU per one drop of this liquid supplement. Yes, I wrote one drop. The bottle contains 1400 one drop servings. I take 5000 IU a day of vitamin D, so I will take 5 drops of this liquid. Several factor should be taken into account when taking vitamin D. Those would be weight, genetics and sun exposure. Average RDA for people 1-70 is 600 IU and for those over 70 years of age 800. Some of us don’t get enough sun exposure because of our location, age or because we don’t get out in the sun. Vitamin D is a fat soluble and is needed for proper absorption of Calcium. People with certain conditions need vitamin D supplementation. I love that this brand is free of unneeded additives. It also has coconut oil to help with the absorption of the fat soluble vitamin D. It is very palatable with a hint of lemon and a slight oily texture because of the added coconut oil. I received this free for my review.