Yoffie, David B., and Sharon Foley. "Cola Wars Continue: Coke vs. Pepsi in the 1990s." Harvard Business School Case 794-055, March 1994. (Revised March 2000.) ...

In 1893, Caleb prepared the concoction by mixing ... In 1898, Caleb Bradham settled on the name ‘Pepsi-Cola’, after the digestive enzyme pepsin, and introduced the beverage in the market ...

The Pepsi-Cola Collectors Club found documentation suggesting that Bradham began experimenting with ingredients to create differently flavored drinks in 1896, before Pepsi-Cola was officially born ...