Vitamin K is a group of structurally similar, fat-solublevitamins that the human body requires for completesynthesis of certain proteins that are prerequisites forblood coagulation and which the body also needs forcontrolling binding of calcium in bones and othertissues. The vitamin K-related modification of theproteins allows them to bind calcium ions, which theycannot do otherwise. Without vitamin K, bloodcoagulation is seriously impaired, and uncontrolled bleeding occurs. Preliminary clinical research indicates that deficiency of vitamin K mayweaken bones, potentially leading to osteoporosis, and may promotecalcification of arteries and other soft tissues.
Vitamin K1, any of a group of vitamins found mainly in green leaves and essential for the blood-clotting process. They include phylloquinone (vitamin K1), menaquinone (vitamin K2), and menadione (vitamin K3).
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