Treatment with tyrosine, a neurotransmitter precursor, reduces environmental stress in humans.
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Link to full study
http://www.ncbi.nlm.nih.gov/pubmed/2736402
Conclusion of this study
Using a double-blind, placebo-controlled crossover design we investigated whether tyrosine (100 mg/kg) would protect humans from some of the adverse consequences of a 4.5 hour exposure to cold and hypoxia. Tyrosine significantly decreased symptoms, adverse moods, and performance impairments in subjects who exhibited average or greater responses to these environmental conditions. These results suggest that tyrosine should be evaluated in a variety of acutely stressful situations.
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