Long before people started turning to Gatorade and Powerade for an energy boost, Dr. Enuf was providing pep for sluggish residents of northeast Tennessee.

Dr. Enuf was developed by Chicago chemist Bill Swartz to aid co-workers who complained of fatigue. It is fortified with B vitamins thiamine and niacin, as well as potassium iodide, caffeine and pure cane sugar, rather than the corn syrup in many soft drinks. It tastes a bit like Sprite or 7-Up, though not as sweet.