Top pick · DoseRank
Why this ranks #1 for reaction time
#1
Nutricost, Caffeine with L-Theanine, 240 Capsules
Nutricost$0.05 / serving4.8 · 953Available now
Why this ranks here
- Evidence fitCaffeine Anhydrous is the strongest evidence signal for this outcome.
- Dose fitCaffeine Anhydrous at 100 mg lands inside the studied 50-300 mg window.
- Price / serving$0.05 per serving — low price tier for this outcome.
- AvailabilityIn stock across major retailers; 99% availability confidence.
- TrustSolid trust signals from buyer ratings, with room to grow.
Trade-offs
Dose fit is the weak spot on this listTrust signals sit below the other picks
The numbers
87
89
71
94
100 mgIn rangeinside the studied 50-300 mg window