Vitamin K has several important functions. For example, it is needed for blood clotting, which means it helps wounds heal properly.
Good sources of vitamin K
Vitamin K is found in:
- green leafy vegetables, such as broccoli and spinach
- vegetable oils
Small amounts can also be found in meat and dairy foods.
As well as getting vitamin K from food, you can also get it from your own body as it is produced by bacteria in the bowel.
How much vitamin K you need
Adults need roughly 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 that your body does not need immediately is stored in the liver for future use, so you do not need it in your diet every day.