Congeners are compounds which are produced during fermentation. Although they contribute to the taste and appearance of the drink, they make hangover symptoms more severe.

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Congeners are by-products of the fermentation process that contribute to the taste, aroma, and appearance of alcoholic beverages. They include substances like methanol, acetone, acetaldehyde, esters, tannins, and some alcohols other than ethanol. While they can enhance the flavor and characteristics of the drink, they are also associated with more severe hangover symptoms, as they can be toxic and affect the body's physiological processes.

Congeners Are Compounds Which Are Produced During Fermentation