There isn’t a single vitamin proven to “open blood vessels” or clear blocked arteries. That wording is common in supplement advertising.
One nutrient worth knowing about is vitamin B3 (niacin). At prescription-level doses, niacin can cause blood-vessel dilation and flushing and can affect cholesterol. However, niacin supplements are not recommended simply to improve circulation, and high doses can cause liver injury, high blood sugar, gout, and other problems. It should not be taken at high doses without medical supervision.
For circulation, what’s more important is treating the underlying cause—such as high blood pressure, diabetes, high cholesterol, smoking, or peripheral artery disease. Regular walking and appropriate cardiovascular treatment have much stronger evidence than taking a “circulation vitamin.”
If you’re experiencing cold feet, leg pain when walking, numbness/tingling, or heavy legs, tell me what symptoms you have. Those can help distinguish a circulation problem from a nerve or vitamin deficiency.
