Not the bluntest of Red Bull clones, the flavor here is gummy but tastes predominately of white grape and cherry, with vanilla and apple in the background. The first two fruits are rather robust and demand more sweetness than the drink provides, but they keep from tasting awkward thanks to the dense sourness and immediate involvement of the next two. There are a few sips where the beverage's dryness is more trenchant than others, but at a small eight ounces this is not much of a problem. The sucralose and ace-k blend do their job nonpassionately; a touch of real sugar and a change from "sugar free" to "low carb" and this would be no issue. That would make a world of difference, but as is at least the flavor tries something different.
The 100 milligrams of caffeine is clearly listed with no Google searching required. Each can also contains: B vitamins, vitamin C, taurine, inositol, ginseng, and ribose. There is not much power from the small size, an hour and a half, perhaps two hour long buzz. For my low expectations, Liquid Lightning Sugar Free is not bad. Not great, but not bad.