Summary:

Vitamin K is a group of vitamins that the body needs for blood clotting, helping wounds to heal. There’s also some evidence vitamin K may help keep bones healthy.

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Vitamin K

Vitamin K is a group of vitamins that the body needs for blood clotting, helping wounds to heal. There’s also some evidence vitamin K may help keep bones healthy.

Good Sources of Vitamin K

Vitamin K is found in:

  • green leafy vegetables – such as broccoli and spinach
  • vegetable oils
  • cereal grains

Small amounts can also be found in meat and dairy foods.

How much Vitamin K do I need?

Adults need approximately 1 microgram a day of vitamin K for each kilogram of their body weight.

For example, someone who weighs 65kg would need 65 micrograms a day of vitamin K, while a person who weighs 75kg would need 75 micrograms a day.

A microgram is 1,000 times smaller than a milligram (mg). The word microgram is sometimes written with the Greek symbol μ followed by the letter g (μg).

You should be able to get all the vitamin K you need by eating a varied and balanced diet.

Any vitamin K 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.

What happens if I take too much Vitamin K?

There’s not enough evidence to know what the effects might be of taking high doses of vitamin K supplements each day.

Vitamins and minerals – NHS (www.nhs.uk)  [1]