Vitamin D, first identified as a vitamin early in the 20th century, is now recognized as a prohormone. A unique aspect of vitamin D as a nutrient is that it can be synthesized by the human body through the action of sunlight. These dual sources of vitamin D make it challenging to develop dietary reference intake values.SOURCES OF VITAMIN D:
· Getting sufficient sunlight.
· Fatty fish, such as salmon, mackerel, and tuna.
· Egg yolk, cheese, beef liver, mushrooms.