What are the recommendations for daily intake of vitamin K?

Updated: Dec 26, 2017
  • Author: Mark Rosenbloom, MD, MBA; Chief Editor: Michael A Miller, MD  more...
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Answer

Vitamin K (ie, phytonadione) is produced by intestinal bacteria (vitamin K-2) and is found in green, leafy vegetables; cow's milk; and soy oil (vitamin K-1). Vitamin K-1 supplements are usually 2.5-10 mg. Phytonadione promotes liver synthesis of factors II, VII, IX, and X.

Measured in terms of adequate intake (as opposed to RDA), the recommendations for daily intake of vitamin K are as follows [14] :

  • Age 19 years or older (males) - 120 mcg

  • Age 19 years or older (females) - 90 mcg

  • Pregnancy and lactation (19-50 y) - 90 mcg


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