Product assessments, institutional reports and university research—identified by evidence type and presented with their scope, findings, citations and limitations.
This section brings together research on energy drink composition, performance, cognition, driving and metabolism. Each entry links to the original publication or project source and explains what the evidence can—and cannot—show.
Results are study-specific. A finding applies to the tested formulation, dose, participants and outcome. It should not automatically be generalized to every energy drink or consumer.
A 36-criterion comparison of product and packaging characteristics. The project reports that the ten highest-scoring products were submitted for laboratory verification in Switzerland.
Limitation: One selected product per brand; laboratory verification was limited to the ten finalists.
Laboratory analysis covered energy, sugars, sodium, vitamins, taurine and other nutrient characteristics in selected sugar-sweetened, sugar-free and mixed formulations.
Limitation: A selected sample from one national market; not designed as a global ranking.
The study examined products collected from Dublin supermarkets. Sugar was analysed by a public laboratory; caffeine values were taken from product labels.
Limitation: Convenience sample from one market; caffeine was not laboratory measured.
The report documents serving sizes, sugar and caffeine in products available during a defined collection period and compares the results with an earlier survey.
Limitation: Time- and market-specific findings should not be generalised globally.
Hashem, He and MacGregor examined declared sugar, energy, caffeine and serving-size information in major UK retailers and monitored reformulation over time.
Limitation: Composition was based principally on declared label data rather than independent laboratory measurement.
Participants completed a five-kilometre treadmill time trial faster after the tested caffeinated, sugar-containing energy drink than after a non-caffeinated, sugar-free placebo.
Limitation: The beverages differed in several ingredients, so the result cannot identify the contribution of caffeine, carbohydrate or their combination.
Participants completed a standardized simulated cycling time trial faster after the tested energy drink than after placebo, while perceived exertion did not differ significantly.
Limitation: A small trained sample and one formulation cannot be generalized to every cyclist, dose or energy drink.
After two hours of driving, participants consumed the tested energy drink or placebo. The drink reduced lane weaving and self-reported sleepiness during later driving periods.
Limitation: The experiment measured simulated driving outcomes, not crash risk, and caffeine does not make dangerously tired driving safe.
The tested caffeinated energy drink improved reaction-time measures and selected short-term physical-performance outcomes compared with placebo in this experiment.
Limitation: The small all-male student sample and product-specific intervention limit generalization to other populations and formulations.
The complete tested drink improved secondary-memory and speed-of-attention measures compared with placebo, while the ingredient fractions produced different patterns of response.
Limitation: The findings concern short-term laboratory tasks and do not demonstrate lasting cognitive improvement.
The caffeine-based tested drink increased measured energy expenditure at selected post-consumption time points; fat oxidation was higher at some time points during the acute test.
Limitation: Laboratory changes in energy expenditure do not establish lasting fat loss. The study was funded by the manufacturer of the tested drink.
A source may be included when it examines identifiable products or a defined sample, states its geography and collection period, explains its methods, reports measurable results, identifies those responsible and provides an original report, journal article, dataset or methodology.
Inclusion does not mean that Energy Drink Facts endorses every conclusion, scoring decision or interpretation.
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