Guarana Energizer

Guarana Energizer

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

Product analysis

57 out of 100

Guarana Energizer is aimed at short-term alertness through caffeine-bearing guarana. The caffeine quantity is unresolved, making its likely strength and alertness effect difficult to predict.

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

Nutrient Quality36

The quality of the guarana preparation cannot be established confidently. Calcium’s form is also undisclosed, preventing a firm judgment about its absorption potential.

Ingredient Transparency81

Both ingredient amounts are listed, but calcium’s form is missing. The guarana quantity does not establish a clear caffeine amount, making its likely stimulation difficult to judge.

Value For Money40

The available information does not support a firm value judgment for either ingredient. Guarana’s unresolved caffeine quantity also makes useful serving comparisons difficult.

Customer Satisfaction74

Customer ratings are very positive, based on a very small body of feedback. The limited number of reviews makes that impression less settled.

Product Focus74

The formula is directed at alertness and energy rather than broad mental performance. Its unresolved caffeine amount and preparation differences leave the practical effect uncertain.

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
A+ Composition And Label DisclosureB- Composition And Label Disclosure
A serving provides 900 mg of guarana. The preparation lists 22% caffeine. The caffeine amount from guarana is not stated in mg. The available information does not establish a guarana-specific value comparison.
How this ingredient is rated

Composition and Label Disclosure100

The preparation type is not specified. The preparation lists 22% caffeine.
Marker and Preparation Disclosure
The preparation lists 22% caffeine.

Composition and Label Disclosure70

The serving contains 900 mg of guarana. The caffeine percentage is 22%; a caffeine amount in mg is not stated.
Amount and Label Disclosure
The caffeine percentage is 22%; a caffeine amount in mg is not stated.

Commercial Price and Usability

A guarana-specific price comparison is unavailable.
Report alternatives

Sources

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

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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 participantsEnergy forGuarana
  10. 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