The Coca-Cola Co. has dismissed claims that a sweetener used in Coke Zero could prove harmful to consumers.

Last week, the drinks giant was the subject of a campaign in Mexico, which cited a report by the US-based Center for Science in the Public Interest, suggesting that sodium cyclamate could "increases the potency of other carcinogens and harm the testes".

When contacted by just-drinks late last week, a spokesperson for Coca-Cola played down the fears. "There is no question about the safety of cyclamate, a low-calorie sweetener used in the formulation of Coke Zero in Mexico and in dozens of other countries around the world," he said.

"Sodium cyclamate has been approved by the health authorities in more than 50 countries and has been approved by the The World Health Organization (WHO) and the European Food Safety Authority."

Coca-Cola Zero was launched in Mexico last year. "Sodium cyclamate is used by the food and beverage industry in more than 50 countries and is used in Coke Zero in dozens of countries around the world, including Germany, Spain, Brazil, Taiwan and Greece," the spokesperson noted.

The company has no plans to change the formulation of Coke Zero in Mexico. "Mexican consumers have clearly expressed their preference for this brand and for its taste, as shown by the great performance Coca-Cola Zero has enjoyed since its introduction," the spokesperson noted. "We are confident that Mexican consumers will continue to enjoy Coca-Cola Zero."