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.
Don't worry that the sunscreen will keep you from getting the sunlight's benefits. Most lotions block the UVA rays but not the UVB rays that help the body synthesize vitamin D. However, the UVB rays pose risk of sunburn as well, which is why it's better not to spend more than the recommended time in the sun.