Sun exposure is the easiest way to get the Vitamin D. The required amount of sun exposure depends upon the skin, age, gender, season and time of the day. Therefore, a right amount of exposure cannot be determined. Vitamin D is stored in the body fat is released when the sunlight is not there.
With the changes in our lifestyle, deficiency of Vitamin D is much more common than we might think. People spend major parts of their days indoors, and even if stepping out they cover themselves, therefore causing Vitamin D deficiency.