Head to head
Caffeine vs Iron
On the strength of human evidence, Caffeine comes out ahead (evidence 88 vs 55). 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 →Iron
Moderateessential if low, risky if you guess
Marketing intensity 60 of 100. Evidence strength 55 of 100. Verdict: Hype ≈ evidence.
Genuinely fixes fatigue when you're iron-deficient. But taking it without a blood test is a real mistake - excess iron is harmful and there's no easy way to get rid of it.
Full evidence on Iron →Side by side
| Metric | Caffeine | Iron |
|---|---|---|
| Overall tier | Strong | Moderate |
| Evidence score | 88/100 | 55/100 |
| Hype score | 60/100 | 60/100 |
| Verdict | Better than its hype | Hype ≈ evidence |
| Safety concern | moderate | moderate |
Quick answers
Caffeine or Iron — which has better evidence?
On the strength of human evidence, Caffeine comes out ahead (evidence 88 vs 55). But they're often used for different things — read each claim before deciding.
Can you take Caffeine and Iron 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.