One notable advertising slogan was `` Made in Scotland from Girders '' . Although not made from girder , Irn-Bru does actually contain iron : it has an ammonium ferric citrate content of 0.002 % . Irn-Bru 's advertising slogans used to be ` Scotland 's other National Drink ' , referring to whisky , and ` Made in Scotland from girders ' , though the closest one can come to substantiating this claim is the 0.002 % ammonium ferric citrate listed in the ingredients .