It's my favorite non-essential amino acid. It's one of the two building-blocks of thyroid hormones. It's an important precursor to catecholamines too, i find. It's tyrosine.
Tyrosine is created in the body from phenylalanine, with iron as a part of the catalysis, and oxygen. If something is missing -- voila, hypothyroidism and STRESS in capital letters. It makes me want to take the "iron-overload" alarmists by the throat and shake. HARD.
I've been supplementing with tyrosine for months now, and i'm very pleased with how it has improved my native thyroid production. I had no idea it was important in stress-management, too, through its role in norepinephrine and dopamine production; it alleviates depletion of brain catecholamines when administered to animals (including humans) who are subsequently exposed to stresses of various kinds.
Of course, i like best those trials which are decently designed and controlled, and use PEOPLE, who (for the most part) differ from mice. ;-) In one, the subjects were kept up all day and night, and given some mood and performance tests, in which tyrosine beat placebo for both kinds of "decline." In another, tyrosine beat placebo again when tried on cadets undergoing combat training, and lowered blood-pressure as well. Yet another showed that tyrosine buffered subjects from the mood and memory decreases in people stressed with cold exposure.
Hmmmm, cold exposure.... Maybe if i up my tyrosine supplementation, i can actually try (and perhaps benefit from) CT?
Well, CT or no CT, i DO plan to increase my daily dose. Who knows what all will improve -- i'll keep you posted.