Vitamin K has several important functions. For example, it's needed for blood clotting, which means it helps wounds to heal properly.
There's some evidence that vitamin K is also needed to help keep bones healthy.
Vitamin K is found in:
Small amounts can also be found in meat and dairy foods.
Adults need approximately 0.001mg a day of vitamin K for each kilogram of their body weight.
For example, someone who weighs 65kg would need 0.065mg a day of vitamin K, while a person who weighs 75kg would need 0.075mg a day.
You should be able to get all the vitamin K you need by eating a varied and balanced diet.
Any vitamin K your body doesn't need immediately is stored in the liver for future use, so you don't need it in your diet every day.
There's not enough evidence to know what the effects might be of taking high doses of vitamin K supplements each day.
You should be able to get all the vitamin K you need by eating a varied and balanced diet. If you take vitamin K supplements, don't take too much, because this might be harmful.
Taking 1mg or less of vitamin K supplements a day is unlikely to cause any harm.
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