I was cynical about these patches, but having used an entire pack during the last year, I can attest to their effectiveness. If I've had a few drinks, a hangover always follows. These patches are not a magic cure, but they dramatically reduce recovery time, reducing nausea and allowing me to eat properly, combined with electrolytes and paracetamol I can shake off most hangovers in short order rather than being incapacitated for most of the day.