MK-7 is a newer agent with more practical applications because it stays in your body longer; its half-life is three days, meaning you have a much better chance of building up a consistent blood level, compared to MK-4 or K1. MK-7 is extracted from the Japanese fermented soy product called natto. You could actually get loads of MK-7 from consuming natto, as it is relatively inexpensive and is available in most Asian food markets.,MK-7 appears to be one more healthful natural substance that can be added to the anti-inflammatory list.