Is horseradish high in vitamin k. there are contradictions on the internet?

Depends on part!: The reason for the contradiction is that the root (the part that is usually eaten) is not high in Vit K (only 2 mcg per 100 grams which is over 3 ounces) whereas the leaves contain 123 mcg per 100 grams- but I don't know anyone who eats horseradish leaves. I advise those on Warfarin to take low doses of Vit K- see http://www.lef.org/magazine/2007/6/report_vitamink/Page-01