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Vitamin K

Vitamin K denotes a group of 2-methilo-naphthoquinone derivatives.

They are human vitamins, lipophilic (i.e., soluble in lipids) and therefore hydrophobic (i.e., insoluble in water).

They are needed for the posttranslational modification of certain proteins, mostly required for blood coagulation.

Normally it is produced in the intestines, and dietary deficiency is extremely rare.

Note:   The above text is excerpted from the Wikipedia article "Vitamin K", which has been released under the GNU Free Documentation License.
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