A discussion by Sarah - HealthyHomeEconomist about Vitamin K supplementation - whether MK-7 (natto) or MK-4 (animal) is better. She says all MK-4 supplements are synthetic (my question: is Thorne brand synthetic?) and that it doesn't stay in the system long enough, thus she uses MK-7 (from fermented soy = natto). Great article which I think might add to the studies of calcium deposits / bone loss due to Vit. K2 being necessary for calcium to go to the right places in the human body.
10 Foods Loaded with Vitamin K2 In the 1930’s, Dr. Weston A. Price discovered an unidentified nutrient which he deemed ‘Activator X.’ This fat soluble nutrient was found in grass-fed dairy, pastured meats, and traditionally fermented foods. Dr. Weston A. Price came to the ultimate conclusion that ‘Activator X’ is an incredibly important nutrient that is absolutely vital for abundant health and wellness. Years later, modern science has named this nutrient vitamin K2.
Gouda: The Nutrient Dense Cheese of Choice -- Gouda cheese is higher than most liver, grassfed butter, and even pastured egg yolks in the critical nutrient Vitamin K2, identified by Dr. Weston A. Price as the elusive “Activator X”.