L-tyrosine and cognition under stress
What 3 graded rows on l-tyrosine agree on for cognition under stress, and where they differ. Counted side by side, never averaged.
Consensus finder Rows from the L-tyrosine page, reviewed Oct 21, 2026 How it decides
What the rows agree on
Each block and row is one graded row from the L-tyrosine page, with its PubMed record.
Your question
L-tyrosine and cognition under stress
3 rows · 120 peopleThey agree: all 3 rows found an improvement.
- DGrade D× 3
- Rows
- 3
- Trials
- 3
- People
- 120
What the rows share
From the rowsThe best-graded row, grade D, is a randomized trial of 80 people (2024) and found an improvement.
The rows run from 19 to 80 people, published from 1999 to 2024: 3 single studies.
The rows
3 improved- DGrade DAttention errors and stress markers during a simulated stress drill · Improved
RCT · n 80 · 2024 · Young adults (mean age 21; 46 men, 34 women) facing a virtual-reality active-shooter drill plus a Stroop and arithmetic challenge (USA)
2,000 mg single dose before the challenge · Single session
The tyrosine group missed fewer responses on the Stroop test than placebo. Salivary stress markers (alpha-amylase and immunoglobulin A) rose with the drill and were not changed by tyrosine.
- DGrade DMemory and tracking during combat training · Improved
RCT · n 21 · 1999 · Military cadets on a demanding combat training course
2 g tyrosine five times daily (10 g/day) · 6 days
The tyrosine group performed better on memory and tracking tasks than the calorie-matched carbohydrate group and had lower systolic blood pressure; mood did not change.
- DGrade DWorking memory during cold exposure · Improved
Crossover RCT · n 19 · 2007 · Healthy volunteers during two 90-minute cold-water immersions
150 mg/kg before each immersion (300 mg/kg total) · Single test day
Cold impaired memory; with tyrosine, correct responses on a match-to-sample memory test rose and study time fell versus placebo.