Called "digestive" because of Sodium bicarbonate in dough. Used brown meal flour high in iron. In USA called Graham cracker. McVitie's a brand of United Biscuits (UK) sell 80-million packets yearly. Each biscuit contains approx 77mg Sodium
COMMENT: Example of medical enterpreneurship. Vide Dr J G B SIEGERT & "Angostura Aromatic Bitters"
