Vitamin K

Vitamin K image Vitamin K is a fat-soluble vitamin. Fat-soluble vitamins are stored in the body in the liver and fatty tissues. Unlike the other fat-soluble vitamins, the body actually stores very little vitamin K. This makes regular dietary intake important. Bacteria in the large intestines help by making a range of vitamin K forms called menaquinones. Vitamin K is also produced by plants (phylloquinone) and is primarily found in green vegetables, brussels sprouts, cabbage, and plant oils. The man-made vitamin K found in supplements is called menadione.


Vitamin K’s functions include:
  • Playing an essential role in the blood-clotting process by making the proteins that stop bleeding
  • Helping your body make other proteins essential for blood, bones, and kidneys

Recommended Intake:

Age Group
(in years)
Adequate Intake (AI)
(in micrograms)
Females Males
1-3 30 30
4-8 55 55
9-13 60 60
14-18 75 75
14-18 Pregnancy n/a
14-18 Lactation
19+ 90 120
19+ Pregnancy n/a
19+ Lactation

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