Original Chart by GrassrootsHealth adapted by Vitamin D Life
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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800 IU vitamin D resulted in 20 ng, 3200 IU resulted in 45 ng – RCT March 2012 has the following
Download the GrassrootHealth PDF.
Short url = http://is.gd/DvsMinutes