[srean]

Theanine is supposed to increase GABA levels in the brain by passing through the blood brain barrier.

From http://en.wikipedia.org/wiki/Theanine

  Rather, its primary effect seems to increase the overall
  level of the brain inhibitory transmitter GABA. 

But doesnt GABA make one relaxed and sleepier and hinder formation of new memories ?

From http://en.wikipedia.org/wiki/Gamma-Aminobutyric_acid#Pharmac...

  Drugs that act as agonists of GABA receptors or increase
  the available amount of GABA typically have relaxing,
  anti-anxiety and anti-convulsive effects.,. Many
  of the substances below are known to cause anterograde
  amnesia and retrograde amnesia.

  Followed by a list of substances that increase GABA levels

I am not knowledgible about these things but I recollect reading that in vertebrates the primary function of GABA is to inhibit synaptic activity. It is probably good for someone who is high-strung or epileptic. But for a normal person is it good to boost GABA levels in the brain ?

Caffeine, I guess, will counter some of these effects, but still it makes me worried to play with brain chemistry. Particularly with supplements.

Edit: To one who downvoted, could you tell me what you found objectionable ?