Tyrosine
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A non-essential amino acid the body makes from phenylalanine, and a precursor used to build the neurotransmitters dopamine and norepinephrine. It is available as a supplement, usually as L-tyrosine.
Why it’s used
Taken to support mental performance and alertness, particularly under conditions like sleep deprivation, cold, or acute stress.
What the evidence is for
offsetting cognitive decline under acute stress conditions such as sleep deprivation or cold exposure.
What the evidence says
A body of research, largely from military and stress-physiology settings, suggests tyrosine can modestly offset cognitive decline caused by acute stressors such as sleep loss, cold exposure, or multitasking demands. Effects on cognition in rested, unstressed people are far less clear, and the literature is smaller than for many other supplements.
Context
Studies showing an effect have generally used single doses in the range of roughly 100 to 150 mg per kilogram of body weight, administered before a stressful task, which for an average adult works out to several grams; this is a stress-specific research context rather than an everyday use pattern.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.