Essential for Bone HealthProvides Immune SupportPromotes Healthy Muscle FunctionDietary SupplementSoy FreeDairy FreeGluten FreeSunshine In a Bottle Known as the "sunshine vitamin," Vitamin D is an essential nutrient that your body needs for healthy bones and teeth, muscle function, and immune support. NatureWise Vitamin D3 4,000 IU delivers the same biologically active form of vitamin D that is naturally produced in the body from sunlight, so that you can get your daily dose of sunshine without the risk of unprotected UVB exposure.