L-Tyrosine worked wonders for my "inattentive ADHD"-like symptoms, and it works better and has fewer side-effects than the medication my physician prescribed.

Just a non-essential amino acid that is a precursor for dopamine (and epinephrine/norepinephrine by extension), 2 thyroid hormones, and interestingly enough, melanin.

Not medical advice. My point is that it turned out what I needed was a "supplement".