Vitamin K2 can be found naturally in the diet. Foods that are rich in vitamin K2 include; natto, animal livers, meats, cheeses, butter and sauerkraut. The main difference between the vitamin k2 found in food and that found in our Synergy K2 supplement is that vitamin K2 typically exists as MK-4 in food, whereas our supplement is MK-7. This is not to disparage foods that are rich in vitamin K2 as they are typically nutrient-dense and nutritionally important for various other reasons. However, our Synergy K2 supplement is more highly concentrated.