Despite the fact that there are many sources of vitamin D, many people still don’t get enough amount of it, thereby leading to a deficiency in this vitamin.
An average adult requires about 200 IU (International Unit) of vitamin D per day. The older an adult is, the higher amount of vitamin D he needs to maintain strong bones.
Vitamin D deficiency is associated with colon cancer, breast cancer, prostate cancer, depression, heart disease and weight gain. Several studies show that people with high levels of vitamin D have lower risks of developing these diseases.