Nootropic
Guarana
Also known as: Paullinia cupana, Guarana seed extract, Guarana powder, Amazonian guarana
Guarana is a natural caffeine source from Amazonian seeds containing 2-7% caffeine by weight, traditionally used for energy and cognitive stimulation. Multiple studies support its effectiveness for enhancing alertness, focus, and physical performance comparable to synthetic caffeine.
Primary uses
- Energy and alertness
- Cognitive function and focus
- Physical endurance and performance
- Mental fatigue reduction
- Mental focus and concentration
- Physical endurance and stamina
- Natural caffeine source
How it works
- Adenosine receptor antagonism via caffeine content
- Central nervous system stimulation
- Potential antioxidant effects from polyphenols
- Enhanced catecholamine release
Dosage
- Typical range
- 200-400 mg daily (guarana powder containing 20-80 mg caffeine per serving)
- Timing
- Morning or early afternoon to avoid sleep disruption
- With food
- Can be taken with or without food; may cause less stomach irritation with food
- Duration
- Safe for regular daily use; effects typically felt within 30-60 minutes
- Special populations
- Avoid or limit in pregnancy, nursing, caffeine sensitivity, anxiety disorders, or cardiac conditions. Pediatric use not recommended.
Forms
- Seed powder· 70/100
- Capsule· 70/100
- Extract· 70/100
- Tablet· 70/100
- Beverage· 70/100
- Powder· 70/100
- Seed extract· 70/100
Safety
Common side effects
- Jitteriness
- Anxiety
- Sleep disruption
- Increased heart rate
- Digestive upset
- Headaches (if overused or withdrawn)
Contraindications
- Pregnancy and breastfeeding
- Uncontrolled hypertension
- Cardiac arrhythmias
- Severe anxiety or panic disorder
- Caffeine sensitivity
- Concurrent high-dose stimulant use
Evidence notes
Good evidence from multiple RCTs demonstrating efficacy for alertness and cognitive function. Caffeine mechanism is well-established; guarana's additional benefits beyond caffeine content are less conclusively proven. Grade B reflects reliable human trial data on standard endpoints.
Grade B: Some human trials support key claims; further confirmation needed.
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