BrewDog Lost AF sits within the brand's AF series as the alcohol-free version of Lost Lager, a dry-hopped pilsner. It was developed following the success of earlier AF releases, with the stated brief being to add a lager to the non-alcoholic lineup. The recipe uses a special yeast strain selected for producing minimal alcohol during fermentation, with Saphir hops providing citrus and stone fruit character. Oats and lactose are included to restore the body and mouthfeel that would otherwise be reduced in a low-alcohol lager format.