Lancet - Association of Vitamin D & HTN

 "Association of vitamin D status with arterial blood pressure and hypertension risk: a mendelian randomisation study"
http://www.thelancet.com/journals/landia/article/PIIS2213-8587(14)70113-5/fulltext
"Interpretation

Increased plasma concentrations of 25(OH)D might reduce the risk of hypertension. This finding warrants further investigation in an independent, similarly powered study."