Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Vitamin D from sun

  1. Jun 29, 2010 #1
    i've read some article about sun exposure to help body produce vitamin D, but, just out of curiosity, which part of body that should be exposed? is only head and hand will be suffice?
  2. jcsd
  3. Jun 29, 2010 #2


    User Avatar
    Science Advisor
    Gold Member

    I read a study that stated that head and arms are insufficient. It seems that a large surface area (back, chest) is preferable. Several studies indicate that 5 - 10 minutes of exposure a day (summer) is sufficient.
  4. Jun 29, 2010 #3
    by insufficient, what will happen? did vitamin D distribute equally to all bones? or will that maybe restrain bones development on the unexposed area?

    sorry, my fundamental biology is very weak
  5. Jun 29, 2010 #4
    There are a number of competing studies and no conensus as to how much D is required per day, so I'm not sure that there is an answer to your question. I can say that Vitamin D is processed in a systemic fashion, wherever it is synthesized in the pigmant of the skin. Keeping one arm bathed in sunlight, and the other in darkness will not deprive the other of the Vitamin D.

    From a practical point of view, you want to maximize your D production, and minimize damage from UV correct? This supports marcusl in that a large surface area in a short time is better than your arms baking for hours.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook