[user104658]

Meh. You can die from taking over the counter pain meds. What's the difference? Unless it's genuinely "risky" then it's "their body, their choice"... surely...

And so long as the people doing it are properly trained and using clean equipment, obviously.

Skeptical that it can cure any hangover in 30 minutes, though. If it's a hangover due to dehydration / nutrient deficiency (that's what most of a hangover is) then yes it will help a lot... if it's one of those extraspecial hangovers where you just drank so much that you actually still have a high blood alcohol level then it's not going to do much at all. It's not a transfusion!