26 U.S.C. § 5411

The brewery shall be used under regulations prescribed by the Secretary only for the purpose of producing, packaging, and storing beer, cereal beverages containing less than one-half of 1 percent of alcohol by volume, vitamins, ice, malt, malt sirup, and other byproducts and of soft drinks; for the purpose of processing spent grain, carbon dioxide, and yeast; and for such other purposes as the Secretary by regulation may find will not jeopardize the revenue.