| The amino acids glutamine and tyrosine will improve concentration, retention and a sense of alertness. |
| Coupled with tyrosine, the caffeine in guarana helps promote muscle performance and neurotransmitter regeneration. |
| The synthesis of these hormones requires the amino acid tyrosine and the trace mineral iodine. |
| Norepinephrine is a potent vasoconstrictor synthesized from tyrosine in the presynaptic neuron. |
| In fact, tyrosine fluorescence is blue shifted relative to tryptophan fluorescence. |
| Indeed, some seed diets fed to cage birds are known to be protein deficient and specifically deficient in tyrosine, cysteine, or methionine. |
