natural hangover cure

I am not a drinker and I really do not have any kind of idea about hangover. So last Saturday my friends were really partying hard and the next morning they had hangover. As I did not drink anything on the previous night I was sober. But I needed to cure their hangover and so I was looking for something natural to cure hangover . While searching on the internet I found out this website where some medicines to cure hangover was available. So I ordered some and made them have those. They were pretty effective I must say.