Vitamin E

Can you take vitamin E with blood thinners?

Updated 10 Nov 2026

Short answer

Ask a doctor or pharmacist first. Vitamin E can slow platelet clumping and work against the clotting factors that need vitamin K. With warfarin or a medicine against platelets, large doses can raise the risk of bleeding, especially when vitamin K intake is low.[1] The amount that matters is not known, but it is probably more than 400 IU a day.[1]

The EU upper limit of 300 mg a day does not apply to people who take blood thinners or medicines against platelets such as aspirin.[2] In the Physicians' Health Study II, where most men also took aspirin, vitamin E raised the risk of hemorrhagic stroke.[1]

Sources (2)

  1. Vitamin E: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements. ods.od.nih.gov
  2. Scientific opinion on the tolerable upper intake level for vitamin E. European Food Safety Authority (EFSA), 2024. efsa.onlinelibrary.wiley.com

More about vitamin e

What is vitamin E?Which foods contain vitamin E?What is vitamin E used for?Who is at risk of vitamin E deficiency?Is vitamin E safe?Does vitamin E prevent heart disease?

For education; not medical advice. Talk to a doctor before you start, stop or change a supplement.