Are tyrosine supp. Helpful to replenish dopamine after Adderall (dextroamphetamine and racemic amphetamine) use on days I don't eat enough protein (dietary sources of tyrosine/phenylalanine)?

Yes. L-tyrosine is a precursor to the stimulatory neurotransmitters Epinephrine and norepinephrine. Adderal, as you implied, depletes your brain and body supplies of these neurotransmitters. Adequate doses of l-tyrosine, in fact, may reduce or eliminate your "requirement" for adderal.