Under German law, it’s illegal to claim that a food or supplement can cure a human ailment or illness. The reason that matters here is that a Frankfurt court has declared hangovers to be illnesses. Thus, even if the supplement is helpful in mitigating hangover symptoms, it can’t be called “anti-hangover” because it gives the impression that the hangover will disappear. As of now, there are no clinically proven cures for a hangover, and to imply otherwise is illegal.
Just in time for Octoberfest – O’zapft is.