Thanks for your quick reply and for the link. Per that paper you should also avoid vitamin E at the same meal as vitamin D and also phytosterols which would mean many plant foods often considered especially healthy. It certainly does make life more complicated! And at least in this paper they did not think they had a final answer on this. Also they suggested a rather low percentage of interference with vitamin D. It's amazing how many studies are done and how few definitive answers we have.

BTW, I take high dose vitamin K2 MK4 (15 mg) with vitamin D and my levels of D go up and down readily based on whether I'm taking D and K2 and the dosage level of the D. If I quit taking them I go back down over several months. I cannot keep above 30 ng/ml with sunshine alone. Of course my experience might not be true for the next person.