This vitamin is fairly straightforward. Basically we need it for blood clotting and to help support our bone structure. Our bodies can manufacture what we need through our intestinal bacteria. It is very rare to be deficient in Vitamin K. Vitamin K2 is produced by our bodies; while Vitamin K1 can be found in the chlorophyll of plants.
So just in case you are worried, here are the top ten foods for Vitamin K according to healthiliciousness.com. First, herbs - basil, sage, thyme - then, dark leafy greens, scallions, brussel sprouts and broccoli. There are spices - chili powder, curry, paprika and cayenne. You can also eat asparagus, cabbage, pickled cucumber and prunes. With foods like this if you do have to supplement it should be delicious.
The information about Vitamin K comes from the Encyclopedia of Natural Healing, Alive Publishing Group, 1997.