Head to head
Caffeine vs L-tyrosine
On the strength of human evidence, Caffeine comes out ahead (evidence 88 vs 45). But they're often used for different things — read each claim before deciding.
Caffeine
Strongthe legal performance drug
Marketing intensity 60 of 100. Evidence strength 88 of 100. Verdict: Better than its hype.
One of the most reliably effective legal performance aids. The catch isn't whether it works - it's timing.
Full evidence on Caffeine →L-tyrosine
Limitedfor stress and sleep loss, not everyday focus
Marketing intensity 55 of 100. Evidence strength 45 of 100. Verdict: Slightly overhyped.
Genuinely helpful for holding cognition together under acute stress or sleep deprivation - but largely useless as an everyday 'focus' pill when you're rested.
Full evidence on L-tyrosine →Side by side
| Metric | Caffeine | L-tyrosine |
|---|---|---|
| Overall tier | Strong | Limited |
| Evidence score | 88/100 | 45/100 |
| Hype score | 60/100 | 55/100 |
| Verdict | Better than its hype | Slightly overhyped |
| Safety concern | moderate | low |
Quick answers
Caffeine or L-tyrosine — which has better evidence?
On the strength of human evidence, Caffeine comes out ahead (evidence 88 vs 45). But they're often used for different things — read each claim before deciding.
Can you take Caffeine and L-tyrosine together?
This page compares the evidence, not interactions. Some supplements interact with each other or with medications — check each one's safety section and talk to a pharmacist before stacking.