Effects of a commercial product containing guaraná on psychological well-being, anxiety and mood: a single-blind, placebo-controlled study in healthy subjects

Conclusions:
In healthy subjects a 5-day treatment with a commercial preparation of guaranà used according to labelled instructions provided no evidence for any major effects on psychological well-being, anxiety and mood. Considering the increasing popularity of guaranà-containing products sold as dietary supplements for fitness purposes, controlled studies are strongly warranted to assess their benefits in comparison to the labelled claims.

Source: Journal of Negative Results in BioMedicine - May 25, 2013 Category: Research Authors: Gianluca SilvestriniFranca MarinoMarco Cosentino Source Type: research