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Vitamin K

Vitamins

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Vitamin K

  • Essential for blood clotting; required for bone formation and cell growth.
  • Useful in the prevention of osteoporosis.
  • Deficiency is rare in adults and causes impaired blood clotting; it is more common in newborns and can cause severe bleeding. Injections of vitamin K1 are typically given to newborns.
  • Symptoms of deficiency include easy bruising and bleeding (nosebleeds, bleeding gums, blood in the urine or stool, or heavy menstrual bleeding).
  • Drugs that deplete: antibiotics, aspirin, phenytoin, phenobarb, cholestyramine, colestipol, orlistat, and mineral oil.
  • High intake of vitamin K from foods or supplements can reduce the effi cacy of blood-thinning drugs (warfarin).
  • Most people get adequate vitamin K from the diet and/or a multivitamin.

  • Food Sources : Green leafy vegetables, cabbage, Brussels sprouts, vegetable oils (canola, soybean, cottonseed, and olive)
  • Adequate Intake : (mcg/day)*
    Men = 120
    Women = 90
    Pregnancy = 90
    Lactation = 90
  • Upper Limit : Not determined
  • Side Effects : No adverse effects known from foods or supplements; those taking anticoagulant drugs should monitor their intake of vitamin K


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