Cola by citric or other isolated acids. Coca-Cola's recipe is maintained as a corporate trade secret. A variety of different sweeteners may be added to cola, often partly dependent on local agricultural policy. High-fructose corn syrup (HFCS) is predominantly used in the United States and Canada due to the lower cost of government-subsidized corn. In Europe, however, HFCS is subject to production quotas designed to encourage the production of sugar; sugar is thus typically used to sweeten sodas. In addition, stevia or an artificial sweetener may be used; "sugar-free" or "diet" colas typically contain artificial sweeteners only. In the 1940s, Coca-Cola
Premium-Cola in order to meet the taste of a wider variety of customers. The protests of the "Interessengruppe Premium" led to some public awareness, but remained unsuccessful as far as Afri-cola was concerned, so they started producing the original recipe cola on their own and named it Premium-Cola. To avoid legal issues with the Mineralbrunnen AG, one ingredient had to be changed later in 2004: phosphoric acid instead of malic acid. This didn't change the taste, but marked a change of attitude for the collective: The afri-cola brand itself was no longer of interest. There is no office, no salaries, and