Question: what is the difference between vitamin k2 mk7 and mk4?
Answer: Discussion. The current study shows that MK-4 has a poor bioavailability at a nutritional level dose, whereas MK-7 is well absorbed and detectable in the blood at nutritional levels. In a study from the Netherlands, they compared the absorption of 900 μg of vitamin K1, MK-4, and MK-9.