Vitamin D3, It is an essential nutrient that our bodies can make on any reasonably sunny day. In fact, it’s called the sunshine vitamin because we can make all we need if we have enough sunlight hitting our skin.
Ultraviolet rays from the sun convert one type of chemical compound in our skin to a substance called pre-vitamin D3, which in turn converts twice more, in the liver and kidneys, into active Vitamin D. There are several forms of Vitamin D3 (Cholecalciferol), which is synthesized in the skin in response to exposure to the sun’s ultraviolet rays; and a synthetic form identified as Vitamin D5. Of the three, Vitamin D3 is considered the natural form of Vitamin D and in the most active.