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Vitamin K 2 or menaquinone (MK) (/ ˌ m ɛ n ə ˈ k w ɪ n oʊ n /) is one of three types of vitamin K, the other two being vitamin K 1 (phylloquinone) and K 3 . K 2 is both a tissue and bacterial product (derived from vitamin K 1 in both cases) and is usually found in animal products or fermented foods .
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]
[6] Because osteocalcin has gla domains, its synthesis is vitamin K2-dependent. In humans, osteocalcin is encoded by the BGLAP gene. [7] [8] Its receptors include GPRC6A, GPR158, and possibly a third, yet-to-be-identified receptor. [9] [10] There is evidence that GPR37 might be the third osteocalcin receptor. [11]
Phytomenadione, also known as vitamin K 1 or phylloquinone, is a vitamin found in food and used as a dietary supplement. [6] [7] It is on the World Health Organization's List of Essential Medicines. [8] It is used to treat certain bleeding disorders, [7] including warfarin overdose, vitamin K deficiency, and obstructive jaundice. [7]
There has been rare reports of oral vitamin K adverse effects. Intravenous vitamin K admission had reports of low blood pressure, shortness of breath, flushing, and other serious allergic reactions. [6] [13] Vitamin K needs to be diluted to an aqueous solution for administration as a it is a fat-soluble vitamin. Reports of hypersensitivity of ...
Vitamin K (phylloquinones, menaquinones, and menadiones) Some sources include a fourteenth, choline. [6] Vitamins have diverse biochemical functions. Vitamin A acts as a regulator of cell and tissue growth and differentiation. Vitamin D provides a hormone-like function, regulating mineral metabolism for bones and other organs.
The term "vitamin K antagonist" is a misnomer, as the drugs do not directly antagonise the action of vitamin K in the pharmacological sense, but rather the recycling of vitamin K. Vitamin K is required for the proper production of certain proteins involved in the blood clotting process.
Pyridoxine is the most stable vitamer of vitamin B 6. Pyridoxine glucoside is a related vitamer that is also found in some plant-based foods. Pyridoxal-5'-phosphate and pyridoxamine-5'-phosphate are vitamers predominantly found in animal-based foods. [3] Fortified foods and dietary supplements commonly provide vitamin B 6 as pyridoxine ...