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.. 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. IRN-BRU.