Facts about vitamin K, or phylloquinone or menadione:
Activates proteins and calcium that play a major role in blood clotting
Intestinal bacteria make a form of vitamin K that accounts for half your requirements
Prevention and treatment of osteoporosis and bone loss caused by steroids
Relieves itching caused by liver disease (e.g. cirrhosis)
Lower cholesterol levels
Can be applied to the skin to remove spider veins, bruises, scars, stretch marks and burns
Used to speed up skin healing and reduce bruising and swelling after surgery
More evidence is needed for most facts
Foods with vitamin K
Check out more vitamin K-rich foods and the amounts they contain
How much vitamin K?
The Recommended Dietary Allowance (RDA) for men is 120mcg and for women 90mcg.
Too much v.s. too little
Too much vitamin K can be harmful for people with kidney disease who are on dialysis. High doses of vitamin K taken by people with liver disease can actually cause clotting problems. People with reduced bile secretion might need to take additional bile salts to help with vitamin K absorption. If taking an anticoagulant, it is important to keep the vitamin K intake consistent.
Do not take vitamin K together with warfarin since they interact with each other!
Vitamin K deficiency is rare, however not taking in the recommended amount may lead to clotting problems, weaker bones and there is a potential risk for developing heart disease.