Online ISSN: 2754-9380

Keywords : Nootropics


The effects of Guarana (Paullinia cupana) supplementation on the cognitive performance of young healthy adults – a Systematic Review

Fanaras Konstantinos; Reinhard Heun

GLOBAL PSYCHIATRY ARCHIVES, 2019, Volume 2, Issue 2, Pages 171-182
DOI: https://doi.org/10.2478/gp-2019-0015

Objectives
Guarana (Paullinia cupana) from the Sapindaceae family, native to the Amazon basin, is a natural stimulant herb that can be found in popular energy drinks, pharmaceutical shops or local herb shops. With the use of natural health products increasing, guarana has gained a fair amount of popularity in the past years. In this systematic review, we examined the effects of guarana supplementation on cognitive performance. A secondary objective was to compare guarana with caffeine on cognitive performance.


Methods
Searches were made in PubMed using the terms ‘Guarana’ or ‘Paullinia cupana’. Filters focused on Controlled Clinical trials. Inclusion criteria were met by studies using interventions with guarana, while focusing on guarana’s effects on cognition. Participants needed to be young, healthy adults. Studies not published in English or Greek were excluded. The last date of our search was March 7, 2019.


Results
A total of 29 studies were identified and screened. After screening, 17 studies were excluded. The remaining 12 studies were found eligible for data extraction. After reading the full text of the 12 studies, 3 studies were excluded. In the end, 9 studies were found eligible for our systematic review (n = 369 participants). In these studies, guarana showed to improve reaction time and accuracy of performance at cognitive tasks. No significant differences were found when comparing guarana with caffeine.


Conclusion
Guarana seems to improve reaction time and accuracy of performance at tasks, but no significant effects were found when compared with caffeine. High quality randomized controlled clinical trials with a low risk of bias are needed to further study the herb.