How All Forms of Vitamin K Become MK-4 in Your Body
Dr. Kumar’s Take:
This study from The Journal of Nutrition helps explain a big mystery in nutrition: why MK-4 is the dominant form of vitamin K found in our tissues, even though we eat mostly vitamin K1 (from greens) and other K2s (from fermented foods). Researchers fed mice different types of vitamin K and tracked how their bodies used it. No matter what kind of K they ate—K1, MK-4, MK-7, or MK-9—their tissues mostly converted it to MK-4. That means MK-4 might be the key “active” form used by our organs, and your body knows how to make it—if it gets enough of the raw materials.