The "Pepsi" and "Cola" parts of Pepsi-Cola come from the pepsin and the cola nuts that were used as ingredients in the orginal soft drink.
Pepsin was a popular ingredient in early soft drinks and chewing gum. In fact, one of Pepsi-Cola's earliest known advertisements in 1903 included that Pepsi-Cola "Aids Digestion," an acceptable claim for a soft drink that contained pepsin. By 1923, the Pepsi-Cola Company no longer used pepsin as an ingredient (The History of Pepsi-Cola 2000).
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