The drink was released in the United Kingdom in October 2007, available in two variants, one with vitamins B3, B12, and vitamin C, and the other containing antioxidants with added green tea and vitamin C. Although Diet Coke Plus Antioxidants is labeled as sugar free, it actually contains 0.1 grams of sugar in the green tea powder per 100ml.

[1][2] On December 10, 2008, the United States Food and Drug Administration wrote a Warning Letter to The Coca-Cola Company that Diet Coke Plus violates the Federal Food, Drug, and Cosmetic Act.

[3] The FDA required The Coca-Cola Company to detail corrective action within 15 days.

"[4] When a food manufacturer or marketer violates federal regulations, the FDA generally will send a letter to the company.

[4] While the letters themselves are not legally binding, the FDA may take the company to court if it does not take corrective action.