The health benefits of vitamin D and calcium are many, and a vitamin D deficiency can cause many health problems. Vitamin D is important for calcium absorption. In fact, this is one of the vitamin's most important functions. Osteoporosis is just one of many conditions which may occur as a result of a calcium deficiency. Insufficient vitamin D can cause this, and this, in turn, can cause many negative health benefits. Find the appropriate vitamin D supplement, such as Cal Mag Pluss from Shaklee and experience the health benefits of vitamin D.