Within the course of a randomised, double-blind, placebo-controlled study, the acute and chronic effects of green oat (Avena sativa) herb extract on cognitive function and mood were investigated. Besides the positive effect of cognitaven® on a physiological stress response, supplementation of the extract significantly improved the working memory of 126 healthy subjects. Remarkably, both acute and chronic intake of cognitaven® resulted in a significant improvement in multitasking settings mirroring the cognitive demands of numerous everyday situations either in work or private context.