This paper conducts a case study of the marketing of Virola malt extract preparation that was popular in early twentieth-century Britainusing advertisements from British newspapers. Using multimodal critical discourse analysis, it explores how marketers drew upon linguistic/semiotic resources to embed Virol in discourses of scientific knowledge and how these discourses were made to appear true. Through targeted marketing campaigns, Virol established consumer bases framed around three health concerns: malnutrition, constipation and anxiety. Using testimonies, buzzwords, photographs and infographics, Virol created an illusion of scientific rationality, yet the studies or authority figures behind their findings were never explicitly specified, leaving consumers to make assumptions about the product's benefits using their own limited understandings. As women were the primary household shoppers, 'scientific motherhood' (and 'wifehood') was also drawn upon, producing a dichotomy that framed women as responsible for their families' health, yet incapable of this responsibility without expert intervention.