Prairie Naturals Vitamin D3 Cholecalciferol 1,000 IU in Organic Extra-Virgin Olive Oil Softgel - 180 CountGetting Enough Vitamin D? Summer or winter, our need for Vitamin D is often far greater than we are getting. Researchers now know that previous recommendations for optimal levels of Vitamin D were much too low. Vitamin D helps strengthen bones. Prairie Naturals Vitamin D3 is the most readily absorbed form. Be sure you get enough of this low cost, highly valuable vitamin. You'll soon feel the difference that Vitamin D makes.