Do you have a link for this science article/research? I've been googling, but all I've found are references to some claims by an Austrian doctor named Friedrich Bischinger who says:
"With the finger you can get to places you just can't reach with a handkerchief, keeping your nose far cleaner. And eating the dry remains of what you pull out is a great way of strengthening the body's immune system. Medically it makes great sense and is a perfectly natural thing to do. In terms of the immune system the nose is a filter in which a great deal of bacteria are collected, and when this mixture arrives in the intestines it works just like a medicine. Modern medicine is constantly trying to do the same thing through far more complicated methods, people who pick their nose and eat it get a natural boost to their immune system for free."
I have teenagers at home & this could be a fun dinner topic. I'm sure my wife will be thrilled!