Studies related to Anger and L-Tyrosine

The Catecholamine Neurotransmitter Precursor Tyrosine Increases Anger During Exposure To Severe Psychological Stress

Effect Increase
Values Figure 1
Trial Design Randomized trial
Trial Length 24 hours
Number of Subjects 78
Sex Both Genders
Notes for this study:
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.