The blue monster rules!!!

They can't be "good" for you. I would imagine that any substance that raises your heart rate would increase the possibility of a heart condition... But I would say that in moderation unless your old and really out of shape, they shouldn't hurt you...
Now mixing them with Vodka is a whole nother story... SUpposed to be pretty bad, but I won't preach. Red Bull and Goose is da bomb.