Guarana Energizer

Guarana Energizer

Source Naturals4.9 (13 ratings)
Format:Tablet Quantity: 100 Tablet(s) · 100 servings
Goals
$14.88 $0.14 per serving

About this product

A large 900 mg seed-extract serving of guarana supplies the central active in a focused tablet format. The seed extract is identified with caffeine as its relevant active but gives no yield supports short-term energy, while any cognitive benefit is likely limited to temporary alertness.

The formula is more convincing for energy than for broad cognitive support. Without caffeine standardization, users cannot compare its stimulant effect with a measured caffeine product.

The active amount is clearly stated and excellent serving economy supports practical use. Missing caffeine yield, extract-marker detail, and fuller use guidance remain the decisive limitations.

Who is it for
  • Adults seeking short-term stimulant support
  • Caffeine-tolerant users who can start cautiously
  • People who prefer a tablet guarana product
Best for
  • Short-term energy
  • Temporary alertness
  • Users comfortable with unstandardized caffeine

Pros

  • Clearly states the guarana amount
  • Offers excellent serving economy
  • Simple tablet delivery

Cons

  • Does not disclose caffeine milligrams
  • Stimulant strength may vary
  • Limited support beyond temporary alertness

Warnings

  • The caffeine amount is undisclosed, so begin cautiously rather than treating extract weight as caffeine weight.
  • Combining this with coffee, energy drinks, pre-workouts, or stimulant medicines may cause jitteriness, palpitations, anxiety, or insomnia.
  • Caffeine-sensitive users, pregnant people, and those with rhythm or uncontrolled blood-pressure concerns should avoid an unquantified stimulant load.

Product analysis

74 out of 100
A focused guarana tablet with a substantial stated amount and excellent serving economy. Unquantified caffeine makes the actual stimulant dose unpredictable.

AI assessment of the formula, label and price. How scoring works

Nutrient quality77

A large guarana seed extract amount is meaningful, but its caffeine yield and extract concentration are undisclosed. The focused guarana formula fits short-term energy and alertness use.

Ingredient transparency72

Listed weights are mostly clear, with no proprietary blend hiding a combined amount. Complete use directions and inactive ingredients are not supplied, while caffeine is named without a percentage or milligram yield, leaving stimulant strength ambiguous.

Customer satisfaction62

The average rating is strong, and the review count is very limited. No review text is supplied to assess recurring complaints or purpose-specific experience.

Value for money87

The formula quality and active contribution reasonably justify the cost. Serving value is good for the disclosed amount.

Format
Tablet
Container
100 Tablet(s)
Per serving
$0.14
Customer rating
4.9 · 13 ratings
Report analysis

Goals

Energy
Impact
High effect
B+ Ingredient FitD- PathwaysB- EvidenceA+ Formulation Logic
Study evidence
Guarana No effect 8 studies
Cognitive Support
Impact
High effect
B+ Ingredient FitC PathwaysB EvidenceA+ Formulation Logic
Study evidence
Guarana Supportive 11 studies

Ingredients

IngredientAmount per servingScore
Calcium
33 mg
Guarana seed ext. (Caffeine)
900 mg 85
Adults 18–50 Dairy Free Sugar Free Vegetarian
Report overview
Guarana (Caffeine) · 900 mg OverallScore85
A+ Composition And Label DisclosureB- Composition And Label Disclosure
Guarana Energizer lists 900 mg of guarana, but the saved form is unknown. The facts show 22% caffeine, though they do not give caffeine yield in milligrams per serving or an alkaloid percentage. The serving price is present, but no comparison by guarana or caffeine amount is provided.
How this ingredient is rated

Composition and Label Disclosure100

The form is recorded as unknown; caffeine is listed at 22%, but no extract ratio or alkaloid percentage is given.
Marker and Preparation Disclosure
The source form is unknown; caffeine is listed at 22%, but no extract ratio or alkaloid percentage is provided.

Composition and Label Disclosure70

The facts give a caffeine percentage but not its milligram yield per serving.
Amount and Label Disclosure
A 22% caffeine percentage is stated, but caffeine milligrams per serving are not provided.

Commercial Price and Usability

The saved facts include a serving price, but no price-per-amount comparison is provided.
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Report alternatives

Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Dietary supplements and fatigue in patients with breast cancer: a systematic review.
    Pereira PTVT; Reis AD; Diniz RR; Lima FA; Leite RD; da Silva MCP; Guerra RNM; de Moraes Vieira ÉB; Garcia JBS · Breast cancer research and treatment · 2019
    Systematic review932 participants8 studies pooledEnergy forGuarana
  2. Purified dry extract of Paullinia cupana (guaraná) (PC-18) for chemotherapy-related fatigue in patients with solid tumors: an early discontinuation study.
    del Giglio AB; Cubero Dde I; Lerner TG; Guariento RT; de Azevedo RG; Paiva H; Goldman C; Carelli B; Cruz FM; Schindler F; Pianowski L; de Matos LL; del Giglio A · Journal of dietary supplements · 2014
    Randomized trial40 participantsEnergy forGuarana
  3. Placebo-Controlled, Double-Blind, Randomized Study of a Dry Guarana Extract in Patients with Head and Neck Tumors Undergoing Chemoradiotherapy: Effects on Fatigue and Quality of Life.
    Martins SPDS; Ferreira CL; Del Giglio A · Journal of dietary supplements · 2019
    Randomized trial60 participantsEnergy forGuarana
  4. Effect of Guarana (Paullinia cupana) on Cognitive Performance: A Systematic Review and Meta-Analysis.
    Hack B; Penna EM; Talik T; Chandrashekhar R; Millard-Stafford M · Nutrients · 2023
    Meta-analysis328 participants8 studies pooledCognitive Support forGuarana
  5. Effects of Acute Guarana (Paullinia cupana) Ingestion on Mental Performance and Vagal Modulation Compared to a Low Dose of Caffeine.
    Talik TN; Penna EM; Hack BP; Harp A; Millard-Stafford M · Nutrients · 2024
    Randomized trial20 participantsCognitive Support Energy forGuarana
  6. Cognitive effects of guarana supplementation with maximal intensity cycling.
    Gurney T; Bradley N; Izquierdo D; Ronca F · The British journal of nutrition · 2023
    Randomized trial25 participantsCognitive Support forGuarana
  7. The effect of plant active substances on cognitive function in healthy older adults: a systematic review and network meta-analysis of randomized controlled trials.
    Feng X; Fan S; Wei F · Frontiers in pharmacology · 2026
    Meta-analysis1,861 participants25 studies pooledCognitive Support forGuarana
  8. The effects of long-term administration of guarana on the cognition of normal, elderly volunteers.
    Galduróz JC; Carlini EA · Sao Paulo medical journal = Revista paulista de medicina · 1997
    Randomized trial45 participantsCognitive Support forGuarana
  9. Cognitive Performance Enhancement Induced by Caffeine, Carbohydrate and Guarana Mouth Rinsing during Submaximal Exercise.
    Pomportes L; Brisswalter J; Casini L; Hays A; Davranche K · Nutrients · 2018
    Randomized trial24 participantsCognitive Support forGuarana
  10. Improved cognitive performance in human volunteers following administration of guarana (Paullinia cupana) extract: comparison and interaction with Panax ginseng.
    Kennedy DO; Haskell CF; Wesnes KA; Scholey AB · Pharmacology, biochemistry, and behavior · 2005
    Non-randomized trial28 participantsCognitive Support forGuarana
  11. Effectiveness of guaraná (Paullinia cupana) for postradiation fatigue and depression: results of a pilot double-blind randomized study.
    da Costa Miranda V; Trufelli DC; Santos J; Campos MP; Nobuo M; da Costa Miranda M; Schlinder F; Riechelmann R; del Giglio A · Journal of alternative and complementary medicine (New York, N.Y.) · 2009
    Randomized trial36 participantsEnergy forGuarana