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vitamin K

   Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson 0.04 sec.

vitamin K

Any of several fat-soluble compounds essential for the clotting of blood. A deficiency of vitamin K in the body leads to an increase in clotting time. In 1929 a previously unrecognized fat-soluble substance present in green leafy vegetables was found to be required for coagulation of the blood; its letter name comes from the Danish word koagulation. A pure form was isolated and analyzed structurally in 1939; several related compounds having vitamin-K activity have since been isolated and synthesized. The form of vitamin K that is important in mammalian tissue is of microbial origin. A synthetic vitamin K precursor called menadione is used as a vitamin supplement.
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For example, recent studies suggest that high doses of vitamin A may raise the risk of hip fracture and that the latest recommended levels of vitamin K may be too low to protect your bones.
Spin the bottle: how to pick a multivitamin. by Liebman, Bonnie / Nutrition Action Healthletter
Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc.
Do Vegetarians Need to Be Concerned About Vitamin A? by Mangels, Reed / Vegetarian Journal
ONE OF THE FIRST SENSORY EXPERIENCES MOST NEW-borns have is the prick of a needle injecting vitamin K into his or her heel.
Are Vitamin K Shots Safe? by Mermer, Cory A. / Mothering
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