In 2004, Kuhnhenn released what it calls an "Experimental High-Gravity Fruit Beer" for the first time. Dubbed Raspberry Eisbock, the lager-style beer comes in at an astounding 15.5 percent ABV, and is brewed with both fresh raspberries as well as raspberry juice sourced from the brewery's home state of Michigan. Interestingly, the brewery produces another beer in the same vein: Blueberry Eisbock (15.5 percent ABV), which was first released in 2013, also in 375ml bottles.
In 2006, Kuhnhenn Brewing Co. out of Warren, Mich. released a version of its olde ale, Fourth Dementia, that had been aged in bourbon barrels for nine months before being bottled. The final beer, named Bourbon Barrel 4th Dementia, comes in at a whopping 13.5 percent ABV and is sold exclusively in 12-ounce bottles.