NOW Foods Liquid Vitamin D-3 400Iu/4 Dropper, 2 ounce (pack of 2) Go to amazon.com Related posts Top 10 best vitamina d vitamina d: Which is the best one in 2022? FeatureStructural SupportHelps Maintain Strong Bones*2 Bottles DescriptionEach drop contains 100 IU of Vitamin D: 4 drops provide 400 IU, 20 drops provide 2,000 IU. A full dropper provides approximately 50 drops, or 5,000 IU.