A conditionally essential amino acid that serves as the rate-limiting precursor for catecholamine neurotransmitters: Dopamine, Norepinephrine, and Epinephrine. Supplementation prevents central catecholamine depletion during acute stress, cold exposure, multitasking, and sleep deprivation, preserving executive cognitive function.
Educational information only — never stop or change a prescribed medication without talking to your prescriber first.
Take on an empty stomach away from protein meals to prevent competition with other amino acids across the blood-brain barrier. Do NOT use if taking MAO inhibitors (risk of hypertensive crisis). Caution in hyperthyroidism or melanoma.
Evidence level: Strong
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