Diet Coke
Diet Coke does not use a modified form of the Coca-Cola recipe, but instead an entirely different formula. The controversial New Coke, introduced in 1985, used a version of the Diet Coke recipe that contained high fructose corn syrup and had a slightly different balance of ingredients. In 2004, Coca-Cola introduced Coca-Cola C2, which it claims tastes much closer to Coca-Cola but contains half the carbohydrates. In 2005, the company introduced Coca-Cola Zero (replaced by "Coca-Cola Zero Sugar" in 2017), a sugar-free variation of regular Coca-Cola.
Coca-Cola BlāK
The French and Canadian versions of Coca-Cola BlāK were sweetened with sugar. The U.S. version of Coca-Cola BlāK replaced sugar with high fructose corn syrup, aspartame, and acesulfame potassium. Consumer Reports taste-testers found the French version to be less sweet and to contain more coffee flavor.