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A member asked:
Do vitamins d3 and k2 cross the blood-retinal barrier?
A doctor has provided 1 answer
Yes: Vitamin K2 is transported in a lipoprotein-associated manner. Vitamin D3 is transported via a receptor (VDR) that is expressed in vascular endothelial cells that line the blood-retinal barrier. http://www.ncbi.nlm.nih.gov/pubmed/14744039 , https://www5.medicine.wisc.edu/~williams/vitamin_K_review_2008.pdf , http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2573398/
Answered 9/14/2014
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