Do you remove the vein on the bottom of shrimp?

Online Answer
There are two "veins." One is a white vein which is on the underside of the shrimp. It is white because a shrimp has clear blood. There is no real food safety reason to remove this one (I don't) but you may do so if it bothers you. The main "vein" is the one which runs along the top of the body.
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The "white vein" on the inner crescent side of the shrimp is the blood vessel. It's white, rather than red, because the blood of shrimp is clear. There's no food-safety reason to remove this one, but you can if it seems more appetizing to you..