Irn Bru is one of the most popular soft drinks in Scotland, so popular in fact that it pushes the two major colas into second and third place in the market. Made originally as a health drink it still contains 0.002% ammonium ferric citrate.

It is currently listed as a banned substance by the U.S. Food and Drug Administration, but then, the Scots always were that little bit tougher than the rest of the world.

http://www.irn-bru.co.uk/