There have been a few studies to show that it's pretty impossible to generate sufficient vitamin d just from sunshine
R Scott wrote:I work with the Amish and Mennonites, so there is a minimum level of coverage needed. That also rules out most of the second hand t shirts with questionable logos and images.
A Philipsen wrote:Another vote for thrift store old guy shirts or old lady shirts - loose, lightweight, cotton or linen button down, long or short sleeves.
I remember learning that Vit D is fat soluble and absorbed into the body through the natural oils on the skin. Almost all modern societies bathe, wash, or shower away far too much of these natural oils to ever get sufficient Vit. D from the sun.
David Wieland wrote:
Maybe topical vitamin D ointment is absorbed via skin oil, but that's a different thing.