Did you know that dark circles under your eyes are a result of the influence of histamine on vasodilation. Histamines dilate blood vessels (vasodilate). So if you are having an allergic reaction that is filling up your histamine bucket, you probably have dark circles under your eyes.
I can attest to this. Ever since I started down the high histamine highway, there are days when I can tell my levels are high just by looking in the mirror.
So get those levels down if you want to look fresh!