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The Reinheitsgebot, sometimes called the "German Beer Purity Law" in English, was a law introduced in Germany in 1516 which restricted the ingredients that could be used in the production of beer to water, barley and hops (at the time, yeast had not yet been discovered). It has been replaced by the modern Provisional German Beer Law which also allows yeast, wheat malt and cane sugar, but which no longer allows unmalted barley.