Vitamin K Benefits Deficiency Foods Vitamin K1 & K2 Supplements
Vitamin K at Amazon.com Health Store
Vitamin K in Health and Disease (Oxidative Stress and Disease)
(Hardcover) ~ John W. Suttie (Author) 4/09
What You Must Know About Vitamins, Minerals, Herbs, & More: Choosing the Nutrients That Are Right for You
(Paperback) ~ M.D. Pamela Wartian Smith (Author) 1/08
Health Benefits of Vitamin K2: A Revolutionary Natural Treatment for Heart Disease And Bone Loss
(Paperback) ~ Larry M. Howard (Author), Anthony G. Payne (Author) 8/06
Vitamin K (K from "Koagulations-Vitamin" in German and Scandinavian languages) denotes a group of lipophilic, hydrophobic vitamins that are needed for the posttranslational modification of certain proteins, mostly required for blood coagulation. Chemically they are 2-methyl-1,4-naphthoquinone derivatives.
Vitamin K1 is also known as phylloquinone or phytomenadione (also called phytonadione). Vitamin K2 (menaquinone, menatetrenone) is normally produced by bacteria in the Large Intestine, and dietary deficiency is extremely rare unless the intestines are heavily damaged, are unable to absorb the molecule, or due to decreased production by normal flora, as seen in broad spectrum antibiotic use.
There are three synthetic forms of vitamin K, vitamins K3, K4, and K5, which are used in many areas including the pet food industry (vitamin K3) and to inhibit fungal growth (vitamin K5).