Sun D3 (30,000IU) supplies the most bioavailable form of vitamin D (cholecalciferol).* Vitamin D is essential to overall health and well-being, it has a wide range of benefits from bone health to immune response.* Our vitamin D3 has no hidden ingredients and is sourced from lanolin.* For higher levels of IU, consider this formulation of vitamin D3 capsules (50,000IU).