D3 1000 uses lanolin as a precursor, providing 1000IU per capsule. USP and European pharmacopeia compliant, this product is also Food Codex grade. Rigorous independent testing includes all supplier medicinal test results verified through independent 3rd party laboratories, thus ensuring the highest quality product. Vitamin D is a factor in the maintenance of good health. It helps in the development and maintenance of bones and teeth; helps in the absorption and use of calcium and phosphorus; and helps to prevent vitamin D deficiency.