The Reinheitsgebot is a bier purity law, established in 1516 to preserve the integrity of bier and protect drinkers. To this day, it mandates that only four ingredients—water, malts, all-natural hops and yeast—can be used in brewing. Anything else cannot be legally called "bier!" Accordingly, our all-natural hops, malts and yeast are hand-selected from Germany for purity, authenticity and quality.