How can people make a vitamin from the sunlight?

Answer 1

Vitamin D is not actually a vitamin. It is a hormone known as calcitrol. When your skin is exposed to UVB light, it converts 7-dehydrocholesterol (present in your skin and bloodstream) into vitamin D, where the liver and kidneys activate it and it begins regulating and enhancing the absorption of the minerals calcium and phosphorus in the body. Since there are very few foods that naturally contain vitamin D (your best options are salmon, mackerel, and cod liver oil) most of us need to rely on either sun exposure or vitamin D-fortified foods (such as milk and cereals) to ensure we get enough.

Answer 2

Sunlight is needed to produce vitamin D. People with dark skin need to protect themselves from UV rays, but at the same time the melanin in their skin means they actually need more sunlight than pale skinned people. Vitamin D prevents rickets.

Answer 3

well people dont make vitamin out of a sunlight..sunlight have already a vitamin..only people benefitted it when they exposed themselves to the heat of the sun..

Answer 4

you don't have to make vitamins from sun there is an ancient technique calls sun gazing but you need proper technique how to do that you get direct response from sun only in one hour before sunset and after sunrise i hour you start 10 seconds first day and keep adding 10 seconds every day with bare feet on the ground takes up to 9 month and in time 44minutes accumulated in that time it's important to be under occulist supervision .you wiil even stop eating hunger and tsste buds will be transform because you will be in very high energy level and all sicknees all depresions will be gone but it;s not for everybody this is how hunger wiil be eleminated on the globe 'guy beyond human thinking

Answer 5

I can't explain better than:
http://en.wikipedia.org/wiki/Vitamin_D#Synthesis_mechanism_.28form_3.29

Summary:
7-dehydrocholesterol --photolyze by UVB--> pre-vitamin D3 --isomerizes--> Vitamin D3