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SupplementScience

Benefits of L-Tyrosine

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

Evidence-Based Benefits

  • Stress-proofing cognition — Mahoney et al. (2007, n=20, military study) found tyrosine 150 mg/kg preserved working memory and psychomotor performance during 24-hour sleep deprivation and environmental stress
  • Cold stress — Shurtleff et al. (1994, n=8) showed tyrosine improved cognitive performance and mood during cold-water exposure that normally degrades performance
  • Catecholamine precursor — tyrosine is hydroxylated to L-DOPA, which is decarboxylated to dopamine, then converted to norepinephrine and epinephrine
  • Multitasking under stress — Thomas et al. (1999, n=20) found tyrosine improved cognitive flexibility and information processing during combined physical and psychosocial stress

What the Research Says

L-Tyrosine is best supported for preserving cognitive performance under acute stress, with multiple military-funded studies demonstrating benefits during sleep deprivation, cold exposure, and multitasking. Its mechanism is straightforward: stress depletes catecholamines, and tyrosine provides the raw material for replenishment. Evidence for cognitive enhancement under normal, non-stressed conditions is much weaker — tyrosine is a "stress buffer" rather than a general cognitive enhancer.

Related Conditions

Cognitive PerformanceStress SupportFocus
Full L-Tyrosine Guide

References

  1. (). Tyrosine supplementation mitigates working memory decrements during cold exposure. Physiology & Behavior. DOI
  2. (). Effect of tyrosine supplementation on clinical and healthy populations under stress or cognitive demands — a review. Journal of Psychiatric Research. DOI