With ingredients such as 20 drops of orange oil, 30 drops of lemon oil and 10 drops of nutmeg oil, it sounds more like a home remedy than a top-secret formula.

But an American radio program claims it has uncovered the exact recipe for Coca-Cola in the pages of a 1979 newspaper.

Britain's Daily Mail reports the program This American Life published a photograph of a handwritten recipe for Coca-Cola from a February edition of the Atlanta Journal-Constitution.

The blend of oils - also including coriander, neroli and cinnamon oils - and alcohol is reported to be the formula for the so-called "Merchandise 7X", which gives the famed soft drink its distinctive flavour.