Part 2/8:
Vitamin K1 is primarily found in plant-based foods like leafy greens and has a half-life of approximately 1.5 to 2 hours. Its main role is in blood clotting.
Vitamin K2 is produced by our gut bacteria (gut flora) and is also present in fermented foods such as natto, as well as animal-based products. K2 is further classified into several subtypes, with MK4 and MK7 being the most studied.
MK4 and MK7: Different Forms, Different Roles
- MK7 has a long half-life of about 3 days, making it highly bioavailable and effective for sustained activity. It is predominantly found in natto, with 100 grams containing around 1,000 micrograms.