I’ve always wondered why taurine is added into energy drinks, because taurine is well known to be a GABA receptor agonist, which is inhibitory to neuronal firing. So if taurine has tranquilizing abilities, why is it added to energy drinks, which are supposed to keep one excited?
It was stated above in the comments that taurine is added to energy drinks probably to alleviate and quench the uncomfortable side effects of caffeine, such as heart palpitation, jitteriness and anxiety. But a can of Red Bull, 250ml, contains 80mg of caffeine which is similar to a cup of coffee. 80 mg of caffeine is not a high amount, therefore it shouldn’t cause jitters for most people. So still, it wasn’t clear for me, why there is a 1 gram of taurine added in a can of Red Bull.
Finally I’ve come across a paper which answered the question:
A ratio of taurine : caffeine (12.5 mg taurine : 1 mg caffeine) inhibits sleep of fruit fly Drosophila (which shares similar sleep–wake cycle mechanisms with mammals) to a greater extent than the equivalent amount of caffeine alone. The same taurine : caffeine ratio is used in Red Bull (1000 mg taurine: 80 mg caffeine = 12.5 : 1), producing the desired effect of energy drinks: sustained activity that is enhanced compared to beverages that contain only caffeine but not taurine, e.g. coffee.
Here is the link to the study:
http://www.dovepress...wed-article-NSSNeurochemistry is a complex subject. Usually the inhibitor should weaken the effect of exciter. In the case of taurine and caffeine, we see the opposite. It seems that at specific ratio sedative, inhibitor (taurine) enhances the effect of a stimulant (caffeine), making caffeine even more potent stimulant.
It’s an interesting example on how subtly various compounds while working together at specific dosage can affect the organism, producing different effects than those substances would when consumed separately.
Edited by Don Taucher, 19 May 2012 - 08:59 PM.