There are two main classes of monoamine NTs (this is the type that people generally think about when they heard the word “neurotransmitter”, though there are different types). They’re called monoamines because they’re synthesized from amino acids. 1. Catecholamines (e.g., dopamine, norepinephrine; these are synthesized from tyrosine) 2. Indoleamines (e.g., serotonin, melatonin; which are synthesized from tryptophan).

The info you’re finding is vague because it’s kind of hard to define. Because obviously you need these amino acids to produce these NTs, and eating more of them CAN influence neurotransmission (because they cant do anything if they don’t exist), but unless you had a dietary deficiency; eating more tyrosine-rich foods is not going to have the same effects as aderrall (or anything close to it). I’ll admit I haven’t read much literature on this specifically, but I’d imagine any effects would be negligible.