The secret ingredient

"But coca has been seen as dangerous since a 1912 convention in The Hague, which established that cocaine could be derived from the leaf. Now, the only company in the United States legally allowed to handle coca is the Stepan Company in Maywood, N.J., which buys from Enaco.
Using leaves imported under a special permit from Peru, Stefan [sic] makes medicinal products and also a cocaine-free extract that is used by Coca-Cola. The company does not comment on the recipe of its flagship beverage."

-From an article about Kdrink, a new beverage made with Coca leaf, in the Times Business Section last Thursday