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Guarana supplementation shortens your reaction time
You think faster and your reaction time is shorter when you supplement with guarana. The administered dose makes little difference, but the form of administration does. Liquid guarana products are especially effective, concludes an American meta-study.
Meta-study
Brian Hack, a researcher at the Georgia Institute of Technology in the United States, traced 8 trials in the scientific literature in which subjects had been given quarana and then had to perform brain gymnastics. The studies also used a placebo group.
Hack aggregated the results of the trials and reanalyzed them.
The doses ranged from 37.5 to 500 milligrams of guarana extract. The amount of caffeine, a bioactive compound in guarana, ranged from 4.3 to 100 milligrams.
Results
Guarana supplementation had no effect on the number of errors the subjects made [Accuracy, ACC], but it did increase the reaction speed (Reaction Time, RT).
Liquid preparations generally worked better than capsules.
It was also remarkable that Hack could not find a relationship between the doses used and the effects. So relatively low doses of guarana extract apparently worked just as well as higher ones.
Active substances
This raises the question of whether caffeine is the only bioactive compound in guarana. The amount of caffeine in guarana in most of the studies concerned was too small to have a significant effect.
Guarana also contains procyanidins A2, B2, B3, B4 and C1, catechin, ent-epicatechin and epicatechin. [Braz. J. Pharmacogn. 2018;29:77-110.]
Source:
Nutrients. 2023 Jan 14;15(2):434.
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