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German purity law stating that the only ingredients that can be used in the production of beer are water, barley, hops, yeast, malted grains, and sugars. Decreed in 1516 Reinheitsgebot is the longest-standing food safety law in the world. Reinheitsgebot also excludes the addition of any preservatives, chemicals, process enhancers, or cheap starches, such as rice and corn.
Read a thorough overview of German beer and Reinheitsgebot
