Should I be taking MK-4 or MK-7 form of vitamin K?

Why Vitamin K2 as MK-7 and Not MK-4. If you decide that taking a Vitamin K2 supplement makes sense to you, which should you choose? If given the choice, I prefer MK-4, the animal form of Vitamin K2 over MK-7 which is the form of K2 from bacterial fermentation. read more

The very latest research at the time I am writing this answer (the study was published in November 2012) is that MK-7 is more significantly absorbed from food than MK-4. However, most of the research into the use of vitamin K2 for bone and vascular health has involved MK-4. Personally, I eat natto rather than taking a supplement. read more

Consequently, I take a Vitamin K2 supplement derived from nonGMO natto. This is the form of Vitamin K2 known as MK-7 (where to find). It is the exact same K2 you would get if you actually ate natto, which many folks find to be an unpalatable food. Another plus is that MK-7 stays in therapeutic doses in the blood much longer than synthetic MK-4. read more

The MK-4 form is shown in research to scavenge calcium from the arteries and generally help the body control its use of calcium, so it is a major positive health influence. The MK-7 form of Vitamin K2 is also helpful but occasionally has a stimulative and heart pounding side effects that are harmless but very annoying. read more