>>18015326 pb
>The MK-7 form of K2 is the most biologically effective and long lived and the most abundant form of K2 in natto.
MK-7 may be converted from phylloquinone (K1) in the colon by Escherichia coli bacteria. However, these menaquinones synthesized by bacteria in the gut appear to contribute minimally to overall vitamin K status.
Vermeer C, Braam L (2001). "Role of K vitamins in the regulation of tissue calcification". Journal of Bone and Mineral Metabolism. 19 (4): 201–6. doi:10.1007/s007740170021. PMID 11448011. S2CID 28406206
Suttie JW (1995). "The importance of menaquinones in human nutrition". Annual Review of Nutrition. 15: 399–417. doi:10.1146/annurev.nu.15.070195.002151. PMID 8527227
Weber P (October 2001). "Vitamin K and bone health". Nutrition. 17 (10): 880–7. doi:10.1016/S0899-9007(01)00709-2. PMID 11684396
The mechanism of action of vitamin K2 is similar to vitamin K1. K vitamins were first recognized as a factor required for coagulation
Anticoagulant therapy is usually instituted to avoid life-threatening diseases, and high vitamin K intake interferes with anticoagulant effects.
EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA) (2017). "Dietary reference values for vitamin K". EFSA J. 15 (5): e04780 See 2.2.1. Biochemical functions. doi:10.2903/j.efsa.2017.4780. PMC 7010012. PMID 32625486
but feel free to take all the vitamin K2 you can afford.