The Catecholamine Neurotransmitter Precursor Tyrosine Increases Anger During Exposure To Severe Psychological Stress
Notes for this study:
|Number of Subjects
In a randomized, double-blind, placebo-controlled trial, 78 healthy participants took 150 mg/kg of tyrosine or placebo before each of two interrogation sessions as part of military survival training, simulating extreme stress conditions.
There wasn't a statistically significant difference for depression, confusion, fatigue, tension, or vigor, but there was more anger in the tyrosine group. There wasn't a statistically significant difference in heart rate or cortisol.