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“Thus, for example, brain levels of tryptophan, tyrosine, or choline can control the rates at which neurons synthesize serotonin , dopamine, or acetylcholine, respectively.”
Metabolism: clinical and experimental • 2008 | View Paper
“Much experimental evidence shows that intracerebral synthesis of various neurotransmitters serotonin , acetylcholine, and catecholamines) may be affected by the amount of their respective precursors (tryptophan, choline and tyrosine)in food.”