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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.
Red wine contains resveratrol, a substance found in the red grape skin, which may prevent damage to blood vessels by reducing the risk of blood clots and lowering LDL. Drinking too much alcohol can cause a host of other health issues, however; so while a glass of red wine at dinner is fine, donât overdo it.