"Congeners" are the biologically active compounds (other than ethanol) that are found in alcoholic drinks.

There are lots of different types of congeners and they include esters, tannins, methanol, and sulfites to name a few.

The science of hangovers is complicated and scientists believe that lots of different factors are involved. More recently, studies have proven that congeners are one of the reasons why we get hangovers.

But what exactly are congeners and how do they make hangovers worse?

In this article, we’re going to cover everything you need to know about congeners and what you can do to avoid them.