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.
Evoca Cola
Evoca Cola was the first and still is the only cola in the world to contain a tasteless extract of black seed ("Nigella sativa"). After initial piloting in London, it was advertised on cable channels with its 'Power of Black Seed' and 'The Original Black Seed Cola' slogans. It relaunched its brand in June 2005 to challenge global soft drink manufacturers such as Coca-Cola and Pepsi-Cola with its own 'Evoca Taste Challenge'. Although Evoca Cola is very similar in taste to Coca-Cola and Pepsi-Cola, it differs in its composition by being made with natural mineral water and with the addition of a special tasteless black seed extract.