Since childhood, I've noticed that when most people get injured they tend to sip the blood from where they got injured claiming that they are doing so, so as not to waste the blood, and furthermore saying that it's better to return the blood back to the body by sipping it.
Since then, I began to wonder if doing such has any side effects. I've never tried it, because as a medical student, it seems inappropriate and very irritating. So in a nutshell,
Does sipping the blood have any side-effects or health benefits?