If you’re referring to the viral claim “one vitamin opens blood vessels and improves circulation,” the answer is often vitamin B3 (niacin)—but that claim needs an important correction.
Vitamin B3 (niacin)
Niacin can cause vasodilation of small blood vessels, producing the familiar flushing, warmth, tingling, and sometimes a temporary drop in blood pressure.
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However, niacin supplements are not a proven way to improve overall circulation or prevent heart attacks and strokes. Large clinical evidence has not shown meaningful cardiovascular benefit, and high-dose niacin can cause significant side effects, including liver problems, increased blood sugar, and gout.
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PubMed Central (PMC)
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The American Heart Association also says routine vitamin/dietary supplements aren’t recommended as a substitute for evidence-based cardiovascular treatment.
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professional.heart.org
Bottom line: Don’t take high-dose niacin simply to “open your arteries.” If you’re experiencing cold feet, leg pain when walking, numbness, or poor circulation, the underlying cause should be evaluated rather than treated with a vitamin.
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