Remarks by President Obama in Address to the United Nations General Assembly. United Nations. New York, New York. 10:12 A.M. EDT. PRESIDENT OBAMA: Mr. President, Mr. Secretary General, fellow delegates, ladies and gentlemen: It is a great honor for me to be here today. I would like to talk to you about a subject that is at the heart of the United Nations -- the pursuit of peace in an imperfect world.
Ultraviolet (UV) Exposure Is Not the Answer. Our bodies manufacture vitamin D when the sun's ultraviolet B (UVB) rays interact with 7-dehydrocholesterol (7-DHC) present in the skin. However, we can produce only a limited amount of vitamin D from UVB.
The main source of this element is exposure to sunlight. Ultraviolet-B radiation waves stimulate the production of vitamin D from a chemical in the skinâs epidermis called 7-dehydrocholesterol, which then promotes proper wound healing. As such, it acts more like a hormone than a vitamin.he relationship between vitamin D and wound healing. An ample amount of vitamin D is essential for proper healing. According to the series âNutrition Minuteâ published in the journal Advances in Skin & Wound Care, sustaining an injury causes the cells in the skin to require higher amounts of vitamin D.