Established 1971 Non-Fish Liver Source Maintains Healthy Bones and Teeth Promotes Immune Health From Sustainable Source Dietary Supplement Our Pledge of Integrity Authenticity Cleanliness Freshness Consistency Accuracy Vitamin D aids in the absorption of calcium, helping to form and maintain healthy bones and teeth, as well as promote immune health. The vitamin D3 found in this product comes from lanolin, a sustainable and safe source. Available in 1000, 2500, and 5000 IU strengths.