Tyrosine is a precursor for the catecholamine pathway. Simply put, the body can produce L-DOPA from tyrosine, followed by dopamine and then noradrenaline. The enzyme tyrosine hydroxylase, considered to be the rate-limiting step in catecholamine synthesis, plays a key role in this process. This explains why tyrosine appears in the literature in the context of "performance support" under stress: when the rate of neurotransmitter consumption increases, the supply of substrate may help maintain the efficiency o