This morning I woke up with an appropriate hangover. For me, the day after I drink is worthless, and I am susceptible to excruciating headaches. I thought I wouldn't even be able to rise from my friend's couch.
I was skeptical, but I popped two of these guys into a glass of water, and 15 minutes after consumption I felt like a million bucks. Highly recommended.
Also recommended - not drinking.