Menaquinone-4 (MK4) and Menaquinone-7 (MK7) are subtypes of Vit K2. MK-7 shows the highest activity in humans than MK4. A study was done to investigate the bioavailability of MK4 and MK7. It revealed that MK7 was better absorbed and reached a maximum level within 6hrs. In addition to that, MK7 was detected up to 48hrs (26). These findings concluded that MK7 was a greater contributor to the effects of vitamin K2 in the body.