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Nootropic

Guarana

Also known as: Paullinia cupana, Guarana seed extract, Guarana powder, Amazonian guarana

B
Evidence

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.

Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.

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The highest-scored Guarana product in our catalog (77/100). Track dose and overlaps in the app.
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Common questions

How much Guarana should I take?

The typical range is 200-400 mg daily (guarana powder containing 20-80 mg caffeine per serving). Safe for regular daily use; effects typically felt within 30-60 minutes

When should I take Guarana?

Morning or early afternoon to avoid sleep disruption. Can be taken with or without food; may cause less stomach irritation with food.

Which form of Guarana is best?

Seed powder. Other forms in the catalog: Capsule, Extract, Tablet, Beverage, Powder, Seed extract.

Is Guarana safe?

Commonly reported: Jitteriness, Anxiety, Sleep disruption, Increased heart rate, Digestive upset, Headaches (if overused or withdrawn).

Which Guarana supplement scores highest?

NOW Foods Energy, at 77/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.

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

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

Products containing Guarana

Top-scoring supplements in our catalog that list Guarana on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.

NOW Foods
Energy
Find on Amazon
77
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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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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.