If you’re fact-checking this headline, the vitamin being referred to is most likely vitamin E. There is a legitimate safety concern—but “raises stroke risk overnight” is misleading.
What the evidence actually shows
High-dose vitamin E supplements can interfere with blood clotting and may increase the risk of hemorrhagic stroke (bleeding in the brain). The NIH notes that this risk has been observed in clinical trials of supplemental vitamin E.
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Office of Dietary Supplements
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A meta-analysis of randomized trials found that vitamin E was associated with about a 22% relative increase in hemorrhagic stroke, while also showing a modest reduction in ischemic stroke. The overall effect does not mean that vitamin E causes strokes in most people.
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PubMed
Important distinction: food vs. supplements
Vitamin E in normal foods—such as almonds, sunflower seeds, vegetable oils, spinach, and broccoli—is not considered the problem.
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Office of Dietary Supplements
The concern is primarily with supplemental, particularly high-dose vitamin E.
Vitamin E can be especially concerning alongside blood thinners or antiplatelet medicines, because it may increase bleeding risk.
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Office of Dietary Supplements
The U.S. Preventive Services Task Force recommends against using vitamin E supplements to prevent cardiovascular disease or cancer, because there is no demonstrated net benefit.
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USPSTF
“Overnight” is the clickbait part
Taking a vitamin E capsule does not mean you’re suddenly going to have a stroke that night. The evidence concerns risk associated with supplementation over time, and individual risk varies.
Bottom line: Vitamin E isn’t a dangerous vitamin when obtained through a normal diet. But taking high-dose vitamin E supplements “for heart or brain health” without a medical reason isn’t supported by good evidence and may carry bleeding risks.
If you tell me the vitamin E dose on the bottle (in IU or mg) and any blood-thinning medicines you’re taking, I can explain whether that particular combination deserves concern.
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