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Menaquinone-4 (also known as menatetrenone from its four isoprene residues) is the most common type of vitamin K 2 in animal products since MK-4 is normally synthesized from vitamin K 1 in certain animal tissues (arterial walls, pancreas, and testes) by replacement of the phytyl tail with an unsaturated geranylgeranyl tail containing four ...
The minimum effective oral dose to change serum osteocalcin levels is 1500 μg/d, where as oral MK-7 is effective on this parameter at 45 μg/d, a level more in line with nutritional intake. In addition, rat studies show that oral MK-7 is better at increasing extrahepatic tissue levels of MK-4 than oral MK-4. [1]
Vitamin K is a family of structurally similar, fat-soluble vitamers found in foods and marketed as dietary supplements. [1] The human body requires vitamin K for post-synthesis modification of certain proteins that are required for blood coagulation ("K" from Danish koagulation, for "coagulation") or for controlling binding of calcium in bones and other tissues. [2]
Vitamin K2 is lauded for a number of important health benefits. But taking too much can be dangerous, health experts say. ... 24/7 Help. For premium support please call: 800-290-4726 more ways to ...
Menadione is converted to vitamin K 2 (specifically, MK-4) by the prenyltransferase action of vertebrate UBIAD1. [4] This reaction requires the hydroquinone (reduced) form of K 3, menadiol, produced by NQO1. [6] Menadione is also a circulating form of vitamin K, produced in small amounts (1–5%) after intestinal absorption of K 1 and K 2.
A 26-person study showing K2 supplementation as MK-4 having no benefit unless the subject as K2 deficient. 26 subjects is small. The ongoing VitaK-CAC study, which should finish its 24-month trial near the end of 2017, studying MK-7 (I wonder if the 12-month data has been published somewhere).