All versions of Coca-Cola Zero sold in various countries are based on the same flavoring formula, and all are carbonated.
Sodium cyclamate, a relatively inexpensive artificial sweetener banned by the U.S. Food and Drug Administration (FDA) since 1969 and once believed to be a carcinogen, has been used in the Coca-Cola Zero versions produced in Germany, Italy, Spain, Portugal, Venezuela, Chile, and some Central American countries.