Yes — this appears to be referring to a viral senior-health video, and the headline is much more dramatic than the scientific evidence supports.
The video claims that certain vitamins—particularly high-dose vitamin D, vitamin E, B6, B12, vitamin A, and niacin—can increase stroke risk, sometimes suggesting that taking them at night can trigger a stroke. Glasp+1
What is actually true?
1. Vitamin D is not known to cause an “overnight” stroke.
Very high vitamin D intake can cause vitamin D toxicity, which can lead to excessive calcium in the blood. That’s potentially dangerous, but the evidence does not support the claim that taking a normal vitamin-D supplement at night suddenly causes a stroke. The “overnight” timing is particularly misleading.
2. Vitamin E deserves some caution.
High-dose vitamin E can have blood-thinning effects and may be concerning for people taking anticoagulant or antiplatelet medicines. But that is very different from saying ordinary vitamin-E intake suddenly causes a stroke.
3. Vitamin B6 can cause nerve damage at excessive doses.
Long-term excessive B6 is well recognized as a cause of peripheral neuropathy—numbness, tingling and weakness. It isn’t accurate to characterize B6 as a vitamin that simply causes a stroke overnight.
4. B12 isn’t established as a stroke-causing vitamin.
In fact, research on B vitamins has generally found either neutral effects or potentially lower stroke risk in some populations. A meta-analysis of randomized trials found B-vitamin supplementation was associated with reduced stroke risk, although results vary by vitamin, dose and population. PubMed+1
5. Folic acid and B6 may actually be protective in some circumstances.
A 2024 meta-analysis of 14 randomized trials involving more than 76,000 participants found that combined B-vitamin supplementation reduced stroke risk in areas without or with partial folic-acid fortification. PubMed
So what’s the real lesson for someone over 70?
The important issue isn’t “never take vitamins after 70.” It’s:
- Don’t take megadoses because a supplement is marketed as “more is better.”
- Check supplements against your prescription medications.
- Be particularly careful if you take blood thinners, have kidney disease, or have other chronic conditions.
- Don’t combine several multivitamins/supplements without checking their overlapping ingredients.
- Take vitamins when there is a genuine nutritional need rather than assuming they prevent stroke.
And most importantly, blood pressure, smoking, diabetes, cholesterol, atrial fibrillation and other vascular risk factors have far stronger established connections to stroke than the ordinary use of vitamins.
So if this headline made you worried about a particular vitamin you’re taking, tell me the vitamin, dose (for example, Vitamin D 5,000 IU), and your age, and I can explain whether that dose is reasonable and what the actual stroke risk evidence says.
