Guinness

Arthur Guinness signed the lease on St. James's Gate brewery in Dublin in 1759, and the site has operated continuously since. Guinness is part of Diageo and is one of the most widely distributed stouts in the world. The brand is known for its nitrogen carbonation, which creates the characteristic cascading settle that distinguishes it from standard carbonated beers: tiny nitrogen bubbles produce a far more stable, creamy head than carbon dioxide carbonation allows.

Guinness has a longer history in the AF category than most mainstream beer brands. Kaliber, an alcohol-free lager produced under the Guinness name but distinct in style from the core brand's dark stout identity, launched in 1986. Guinness 0.0, the flagship AF stout, followed in October 2020 after four years of development by the St. James's Gate brewing team. Guinness 0.0 is produced using cold filtration: a technique in which the finished beer passes through filters at low temperatures to remove the alcohol without applying heat that would alter the liquid's character. The product retains nitrogen carbonation, preserving the same cascading settle as the alcoholic original.

The range carries broad distribution across mainstream supermarkets and specialist alcohol-free retailers. The combination of the Guinness name and the mid-range price point has made the 0.0 stout the default reference product in the AF stout category for Dry January participants and sober-curious consumers. The four-year development period reflects the technical difficulty of replicating nitrogen-driven texture and roast character in a dark beer at 0.0%, a problem that takes considerably longer to solve than a comparable pale lager.