Two supplements can ‘interfere’ with vitamin K in the body

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Some people rely on vitamin supplements to remain healthy, particularly in the winter months. Without certain vitamins our bodies will struggle to function as normal. However, certain supplements can also have a negative impact – if not taken correctly.

According to nutritionist Rory Batt, from meal prep company Marvin’s Den, taking too much vitamin E and vitamin A can have an adverse effect on vitamin K levels in the body.

This can ultimately lead to “haemorrhaging” as well as excessive bruising as vitamin K is vital for blood clotting and wound healing.

Speaking with, he explained: “Vitamin E supplementation (more than one gram a day) can interfere with vitamin K function.

“This may impact blood clotting function.

“Basically, the mechanism that’s thought to be responsible for this is vitamin E which may compete for metabolic resources with vitamin K, and subsequently cause excess vitamin K to be released from the body, depleting levels of vitamin K (and reducing blood clotting ability).”

This was backed by a study published in The American Journal of Clinical Nutrition.

Following a 12-week trial- in which 70 people were given vitamin E supplements it concludes: “High-dose vitamin E supplementation increased protein induced by vitamin K absence-II (PIVKA-II) in adults not receiving oral anticoagulant therapy.

“The clinical significance of these changes warrants further investigation, but high doses of vitamin E may antagonise vitamin K.”

Mr Batt said taking vitamin A could cause a similar outcome.

“Vitamin A supplementation (less than three grams a day) can interfere with vitamin K function.

“This time it’s actually the absorption of vitamin K that’s affected by too much vitamin A.

“So, like above, when there is inadequate vitamin K then there can be a reduced ability for blood clotting, as well as poor bone health.”

He added: “Basically, a lot of proteins are dependent on vitamin K for blood clotting, as well as proteins important for bone formation and mineralisation.”

Vitamin K can be found in:

  • Green leafy vegetables – such as broccoli and spinach
  • Vegetable oils
  • Cereal grains.

Meat and dairy foods also contain small amounts.

The NHS says you should be able to get all the vitamin K you need from a balanced diet.

It adds: “Adults need approximately one microgram a day of vitamin K for each kilogram of their body weight.

“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.

“If you take vitamin K supplements, do not take too much as this might be harmful.

“Taking one mg or less of vitamin K supplements a day is unlikely to cause any harm.”

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