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One vitamin that opens blood vessels and improves circulation

If you’re referring to a vitamin associated with blood-vessel dilation and circulation, the answer is often vitamin B3 (niacin). How niacin affects blood vessels Niacin can cause vasodilation, particularly in the skin, by increasing blood flow to small blood vessels. This can produce the familiar “niacin flush”—warmth, redness, itching, or tingling. However, there’s an important …