Vitamin D levels do not vary much with minutes in the sun

Original Chart by GrassrootsHealth adapted by VitaminDWiki

Possible reasons that vitamin D levels to not rise much with time in the sun include:

• People laying down generate more vitamin D, but people not lay down for much more than 30 minutes/day
  • people standing up generate 2X-3X less vitamin D than when laying down.
• Seniors have more time avaiable get sun for many hours per day but
  • Seniors tend to wear more clothes while outdoors, and so generate less vitamin D/minute
  • Senior skin generates about 3X less vitamin D per minute
• Tan created by being in the sun a lot will decrease the amount of vitamin D generated per minute in the sunl

200 IU needed to increase vitamin D levels by 1 ng (not 100 IU) – summary of 25 studies – Feb 2014 has the following chart

Miuch less vitamin D generated when standing up

Much less vitamin D generated as you get older

Overview Vitamin D Dose-Response has the following

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Vitamin D response: 800 IU: 20 ng, 3200 IU: 45 ng – RCT March 2012 has the following

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Short url = http://is.gd/DvsMinutes