IRN-BRU Sugar Free has no calories and all of the sugar taken out. Launched in 1975 and made to the unique IRN-BRU secret recipe. A great IRN-BRU taste with no sugar. 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.