L-Tyrosine is a non-essential amino acid that serves as a precursor to several important neurotransmitters, including dopamine, norepinephrine (noradrenaline), and epinephrine (adrenaline). These neurotransmitters play critical roles in mood, motivation, stress response, and cognitive function. L-Tyrosine supplements are often used to improve alertness, focus, and mood, particularly under conditions of stress or sleep deprivation, by supporting the body's ability to produce these catecholamines.
sometimes El tyrosine which is a precursor to dopamine
""Andrew Huberman mentions L-Tyrosine as a precursor to dopamine, noting its presence in lists of things that can enhance alertness and focus."