Caffeine
1,3,7-trimethylxanthine
Key Benefits
Alertness & Focus
Increases vigilance, attention, and reaction time by blocking adenosine and enhancing dopamine and norepinephrine activity. Effective even at low doses (75mg).
Cognitive Performance
Improves working memory consolidation, sustained attention, and mental stamina. Particularly effective against fatigue and sleep deprivation.
Physical Performance
Enhances aerobic endurance, muscular strength, power output, and reduces perceived exertion. Effective across endurance and high-intensity exercise.
Neuroprotection
Regular moderate intake associated with reduced risk of cognitive decline, Parkinson's, and Alzheimer's disease in observational studies.
Activation Synergies
L-Theanine (100-200mg) smooths caffeine stimulation, reducing jitters and anxiety while maintaining focus. 2:1 ratio (e.g., 200mg L-Theanine + 100mg caffeine) provides calm, focused energy.
Recommended Dosage
medical_servicesFDA safe limit: 400mg/day for adults (~4 cups coffee). Cognitive benefits: 40-200mg taken 30-60 min before tasks. Exercise: 3-6 mg/kg body weight 60 min pre-workout (typically 200-400mg). Tolerance develops within 1-4 days—cycle off periodically or use strategically. Avoid within 6 hours of sleep. Start low (50-100mg) to assess sensitivity. Pregnant women: limit to 200mg/day.
Deficiency Indicators
- Chronic fatigue or low energy
- Difficulty concentrating or staying alert
- Poor exercise performance or motivation
- Morning sluggishness despite adequate sleep
Scientific Citations
Caffeine: Research Summary
Caffeine: Pharmacology & Clinical Effects
ISSN Position Stand: Caffeine and Exercise Performance
Status: In Your Stack Status: Not in Stack