Post by Peter PerrosHas anyone tried taking this to treat their tinnitus?
Nope
No credible evidence for any positive impact on T.
Able to cross the blood-brain barrier
<http://en.wikipedia.org/wiki/Blood-brain_barrier>, theanine has
psychoactive <http://en.wikipedia.org/wiki/Psychoactive_drug>
properties.^[6]
<http://en.wikipedia.org/wiki/Theanine#cite_note-gomez-5> Theanine has
been shown to reduce mental and physical stress
<http://en.wikipedia.org/wiki/Stress_%28medicine%29>,^[7]
<http://en.wikipedia.org/wiki/Theanine#cite_note-kimura-6> and improves
cognition and mood in a synergistic manner with caffeine
<http://en.wikipedia.org/wiki/Caffeine>.^[8]
<http://en.wikipedia.org/wiki/Theanine#cite_note-pmid18006208-7> ^[9]
<http://en.wikipedia.org/wiki/Theanine#cite_note-8>
While structurally related to the excitatory neurotransmitter glutamate,
theanine only has weak affinity for the glutamate receptor on
postsynaptic cells.^[10]
<http://en.wikipedia.org/wiki/Theanine#cite_note-9> Rather, its primary
effect seems to increase the overall level of the brain inhibitory
transmitter GABA <http://en.wikipedia.org/wiki/GABA>. Theanine also
increases brain dopamine <http://en.wikipedia.org/wiki/Dopamine> levels
and has a low affinity for AMPA
<http://en.wikipedia.org/wiki/AMPA_receptor>, kainate
<http://en.wikipedia.org/wiki/Kainate_receptor> and NMDA receptors
<http://en.wikipedia.org/wiki/NMDA_receptor>.^[11]
<http://en.wikipedia.org/wiki/Theanine#cite_note-nathan-10> Its effect
on serotonin <http://en.wikipedia.org/wiki/Serotonin> is still a matter
of debate in the scientific community, with studies showing increases
and decreases in brain serotonin levels using similar experimental
protocols.^[12] <http://en.wikipedia.org/wiki/Theanine#cite_note-11>
^[13] <http://en.wikipedia.org/wiki/Theanine#cite_note-12> It has also
been found that injecting spontaneously hypertensive mice with theanine
significantly lowered levels of 5-hydroxyindoles
<http://en.wikipedia.org/wiki/5-hydroxyindole> in the brain.^[14]
<http://en.wikipedia.org/wiki/Theanine#cite_note-yokogoshi-5hydroxyindoles-13>
Researchers also speculate it may inhibit glutamic acid
<http://en.wikipedia.org/wiki/Glutamic_acid> excitotoxicity
<http://en.wikipedia.org/wiki/Excitotoxicity>.^[11]
<http://en.wikipedia.org/wiki/Theanine#cite_note-nathan-10> Theanine
also promotes alpha wave <http://en.wikipedia.org/wiki/Alpha_wave>
production in the brain.^[6]
<http://en.wikipedia.org/wiki/Theanine#cite_note-gomez-5>