New IRN-BRU Xtra. Xtra Taste. No Sugar. A new IRN-BRU which is BIG on taste and has no sugar. We've added even more of the unique IRN-BRU taste made to our secret recipe. New IRN-BRU Xtra has no calories and all of the sugar taken out. BRU'd in Scotland since 1901 to a secret recipe of 32 flavours with a spirit that's as bold as its taste. You can't describe it, because there's nothing like it. The Strong Soft Drink An indescribable brand with a phenomenal taste. Throughout the years, IRN-BRU's irreverent and humorous advertising has continued to entertain and refresh fans up and down the country.