Caffeineand Mental Speed.
Evidence gradeA
ImpactModerate
Confidencehigh
Imported rating. This grade comes from SuppCo and has not been independently reviewed. It describes research, not a product, and it is not medical advice.
The rating
- Direction
- Favourable
- Rated by
- SuppCo
- Observed
- 28 September 2026
Studies behind it
A review of caffeine’s effects on cognitive, physical and occupational performanceT. Mclellan · Neuroscience & Biobehavioral Reviews2016Mental Performance and Sport: Caffeine and Co-consumed Bioactive IngredientsD. Kennedy · Sports Medicine (Auckland, N.z.)2022Effects of acute caffeine consumption following sleep loss on cognitive, physical, occupational and driving performance: A systematic review and meta-analysisC. Irwin · Neuroscience & Biobehavioral Reviews2019