"Beard Beer is brewed with a yeast created from brewmaster John Maier's beard," reads the explanation on Rogue's website.
After searching for a yeast to complement the local Oregon ingredients in a new beer, Maier - whose "old-growth" beard has been flourishing since 1978 - eventually turned to his own beard yeast.
As for the taste of Beard Bear, reviewers on Beer Advocate say the golden ale has notes of bread, citrus, and banana, with a slight sourness and a dry finish.
Let's just hope Maier washed his beard before he took the specimen.