Vitamin D is actually a hormone and requires activation to f

Vitamin D is actually a hormone and requires activation to facilitate absorption of calcium by our bones. Our vitamin D levels are controlled by intestinal absorption (foods like fish, liver and milk) and through UV radiation of our skin. It used to be that skin was an adequate method for vitamin D synthesis, but that has become less the case in recent history. Why do you think we don\'t get enough vitamin D synthesis from our skin anymore?

Solution

Few reasons why Skin exposed to sunlight is not making enough Vitamin D are

People think that dairy products which are fortifying with Vitamin D in US. So people think it is enough to the body and forget to expose to light. But after consuming it all the added Vitamin D is not absorbed by the body instead getting out by excreatary system.

second one is use of sunscreen lotions or protectors which will absorb 99% of UV light so it decreases the total synthesis of Vitamin D3.

thirdly taking sunbath under glass roof.