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Alcohol dilates peripheral blood vessels, but has been known to actually. constrict some blood vessels in the brain, lowering the oxygen content. Alcohol dilates peripheral blood vessels, but has been known to actually  constrict some blood vessels in the brain, lowering the oxygen content.
âMore effective than any other factor in the body, nitric oxide can dilate the smooth muscle of the blood vessels. With this dilation, the vessels can relax and allow blood to flow easily through them â and quite possibly lower the blood pressure.â.