Vitamin D is the sunshine vitamin! A deficiency of vitamin D can result in rickets in children, and in adults, a lack of bone strength and density and even joint pain. Vitamin D is absolutely vital for the development and maintenance of bones and teeth. In Canada, Vitamin D3 becomes one of the most important vitamins we can take with our short winter days and relative lack of sunshine. A delicious orange liquid format makes it easy to take this critical vitamin.