Adult Vitamin K Deficiency

Vitamin K deficiency is uncommon in healthy adults for a number of reasons: 1) vitamin K is widespread in foods (see Food sources), 2) the vitamin K cycle conserves vitamin K, and 3) bacteria that normally inhabit the large intestine synthesize menaquinones (vitamin K2), though it is unclear whether a significant amount is absorbed and utilized. Adults at risk of vitamin K deficiency include those taking vitamin K antagonist anticoagulant drugs and individuals with significant liver damage or disease.

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