For some reason nothing i've ever brewed has ever given me or any friends a hangover worthy of note, if one at all. And this includes many many gallons of varying levels of quality of turbo cider, kit cider, turbo wine, kit wine, kit beer and even mead (though i've never been wangled on excessive amounts of mead, it takes yonks to mature). The only time we do get proper synapse-meltingly bum-wateringly bad hangovers is when we're on the mass produced crap all day...that orr my own special homemade Grog

But that's not brewed so it doesn't count...