Proof.Fit

Caffeine

11 benefits mapped to clinical evidence across supplements.

Benefit Evidence

Alertness
Strong

Alertness +, RT↓

Blood pressure +, alertness +

17,229 people
Focus & concentration
Strong

Caffeine: faster attention +RT

Drunk: partial RT rescue

Sleep loss: alertness +RT

18,692 people
Productivity
Strong

Reaction time + mood

Memory/attention + endurance

Driving/sport speed +10%

14,221 people
Energy & Fatigue
Strong

Endurance +44-51%

Adrenaline/glycerol up

Alertness/fatigue improved

7,073 people
Mental clarity
Strong

Reaction/memory +

Alertness/EEG +

16,095 people
Pain relief
Strong

Pain relief +26 pp

Faster onset, longer relief

17,710 people
Workout performance
Strong

Endurance +1–50%

Strength/power +2–16%

1,783 people
Endurance
Strong

Endurance +3-51%

Power/RPE: improved

1,622 people
Mood balance
Strong

Alertness↑ mood

Fatigue↓ irritability↓

1,703 people
Metabolism
Moderate

Fat oxidation + EE

CYP1A2 metabolism -32%

AUC/clearance changes

810 people
Motivation & confidence
Moderate

Motivation/confidence +5-15%

Effort & vigilance +1-14%

674 people