Vasoconstriction happens in the presence or absence of alcohol?
Anyway alcohol will lyse some cells. alcohol in the long run stiffens up and damages the walls of your arteries, but alcohol also thins the blood allowing for more flow.
the antioxidants, from dark beer, or the red color from beetroot juice that stains your insides and your teeth and mouth also stains your arteries and gives them a "protective layer" that these scientists claim to protect your arterial walls.