Red Bull has loads of Taurine in it.
I have no idea what Taurine is or does.
Hope that helps!
Edit: More info on Taurine..
Taurine is one of the active ingredients commonly found in
energy drinks such as
Red Bull, and in pills which often feature
caffeine and/or other stimulant ingredients. The manufacturers claim that taurine enhances the effects of
caffeine, but to date there have been no studies performed to confirm this.
Taurine (from
taurus = ox, as it was discovered in ox bile) or
2-aminoethanesulfonic acid is an acidic chemical substance found in
bile,
urine, as well as juices and fluids of
muscle,
lungs and
nerve tissue of many animals, and plays several important roles in the body and is essential to newborns of many species. While it is often referred to as an
amino acid, this is an inaccurate categorization since it does not contain any
carboxylic acid functional group. Taurine may also come from synthetic materials.
The Taurine in Red Bull has been confirmed to come from synthetic sources and not Ox urine. Phew!