Dr Enuf is a caffeinated, vitamin-fortified, lemon-lime Soda bottled since 1949 by Tri-Cities Bottling Corporation in Johnson City, Tennessee (USA). With 72mg caffeine, 47g carbohydrate, 260% DV Thiamine, 90% DV Niacin and 80% DV Iodine per 12.68oz (375ml) bottle (it is also sold in 10oz bottles), it may very well be the first such "energy drink" to have been on the market. It is also one of the relatively few U.S. soft drinks still sweetened with cane sugar: its bottler refuses to use corn syrup, due to inferior flavor.