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Congeners are toxic byproducts of distillation and fermentation.
These chemical impurities are the substances responsible for giving each drink its individual taste, color and aroma. Congeners do not cause drunkenness, but do add to your hangover. Some spirits are higher in congeners than others. Red wine, brandies, and whiskies are usually higher than other types of alcohol. Each spirit has its own identifying congeners which give it a unique flavor.