Topical vitamin D might be more bio-available than oral – Oct 2015

VitaminDWiki Summary

Yet another group feels that topical vitamin D is better than oral
Both of their references are on VitaminDWiki
This is not the current consensus opinion, but may be correct
See also VitaminDWiki

TRANSDERMAL VS ORAL VITAMIN D ABSORPTION Health Cloud

The following are the graphics from a 2-3 page article
From Reference #1
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Article has the following chart, but does not seem to tell where it came from
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References

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