There has been a lot of interest recently in Vitamin K2. The brief summary is that K2 is the missing vitamin, those synergies with Vitamin D and calcium for enhanced mineral utilization. In other words, vitamin K2 is supposed to help us absorb calcium, which will help your teeth (and gums, and the rest of your body) get a lot stronger.
I recommend getting vitamin K2 from real foods, and not supplements which are usually isolated vitamins. The reason I recommend using real foods is that animal fats, from wild caught or grass-fed animals are the historical way people obtained vitamin K2 in their diet. They also used insects, but that is a discussion for another time.
K vitamins are a part of a class of compounds called quinones. Natural quinones form a class of pigments that range in color from yellow to black. These pigments are found in bacteria. So the healthiest form of K2 is going to be a naturally pigmented bacterial rich food and that is cultured grass-fed butter. Traditionally, ghee (clarified butter), is made from cultured cream. Ancient cultures intuitively knew the nutritional benefits of healthy bacteria in food health and storage.
So if you have a choice, try cultured butter, or ghee. Have at least a teaspoon a day, if not more of this amazing, nutritional, tasty fat. And if you need a more therapeutic form of K2 in your diet, try high vitamin butter oil or blue ice royal