Promotes optimum calcium absorption - delivers 1,000 IU of vitamin D3 in its most active and beneficial form: Cholecalciferol. Vitamin D3 is the single most important vitamin to supplement. Combines Vitamin D with Calcium and Magnesium to promote optimum Calcium absorption and support bone health. Calcium cannot be absorbed without adequate Vitamin D, which makes Vitamin D just as important as Calcium for bone health Superior bio-active ingredients - Provides the most active and beneficial form of vitamin d3, calcium and magnesium. also: Vitamin C. Contains no Milk / Dairy-Free, Gluten-Free; no soy, yeast, wheat, sodium, salt, sugar, fat, cholesterol, color, preservative, common allergens or manufacturing additives Unsurpassed purity, quality & efficacy. Won't upset your stomach! - For 40+ years ProCaps products have been additive free, they contain no binders, fillers, lubricants, stabilizers, flowing agents, preservatives or artificial colors. Easy-to-swallow capsules (no tablets) deliver only the most bioactive vitamins, minerals & ingredients in an ultra-fine micro-granulated powder for fast, complete absorption & maximum effectiveness. Non-acidic formula is gentle even on most sensitive stomachs Manufacturer direct and made in Henderson, Nevada - Ethical and eco-friendly, ProCaps formulates, manufactures, and controls every aspect of its products: from formulation, ingredient sourcing, production and quality control. ProCaps' facilities are 100% Solar Powered with a Zero Carbon Footprint. All ProCaps bottles are made from 100% recyclable post-consumer resin. Plus, Andrew Lessman and ProCaps are the largest donor of prenatal vitamins in the world (over 2 billion capsules donated to date) Ethical & Eco-friendly. Zero Carbon Footprint - Uniquely committed to your health and the health of the planet, ProCaps' facilities are 100% Solar Powered with a Zero Carbon Footprint and an LEED Gold green building status. All ProCaps bottles are made from 100% recyclable post-consumer resin. Plus, Andrew Lessman and ProCaps are the largest donor of prenatal vitamins in the world (over 2 billion capsules donated to date). ProCaps, the Informed Choice for Nutritional Supplements Andrew Lessman's VITAMIN D3 1000 contains 1,000 IU of Vitamin D3 in its most active and beneficial form - Cholecalciferol. Overwhelming scientific research has validated Vitamin D3 as the single most important vitamin to supplement. We also combine our Vitamin D with Calcium and Magnesium, because of their shared role in bone health. In fact, Calcium cannot be absorbed without adequate Vitamin D, thus making Vitamin D just as important as Calcium for bone health. That should be enough to encourage everyone to consume extra Vitamin D, but it is Vitamin D's other exciting benefits that are making headlines and have experts urgently seeking to raise the recommended intake of Vitamin D. The body can only produce small amounts of Vitamin D when exposed to sunlight (UV radiation), but reduced sun exposure and increased use of sunscreens, as well as the normal aging process, makes our own internal production of Vitamin D extremely limited and unreliable. Moreover, Vitamin D is not readily available in food - only present in small amounts in some fish and eggs. As a result, for over 30 years, ProCaps has always provided extra Vitamin D in all of our multivitamins and Calcium products. An enormous amount of recent research has confirmed the wisdom and necessity of consuming extra Vitamin D, and with our VITAMIN D3 1000 you receive the benefits of the most active form of Vitamin D, plus a bonus of essential Calcium and Magnesium.