“Because Warfarin treatment had no effect on the elevation in serum calcium produced by vitamin D, the synergy between Warfarin and vitamin D is probably best explained by the hypothesis that Warfarin inhibits the activity of matrix Gla protein as a calcification inhibitor.”
“High levels of matrix Gla protein are found at sites of artery calcification in rats treated with vitamin D plus Warfarin , and chemical analysis showed that the protein that accumulated was indeed not gamma-carboxylated.”