Abstract: A composition with enhanced thermogenic activity and the use thereof in the prevention and treatment of obesity Pharmaceutical compositions of a dietary supplement or medical device, useful for the treatment and prevention of overweight and obesity and metabolic syndrome comprising: a) menthol or a peppermint essential oil comprising menthol, in association with one or more components having a thermogenetic activity, selected from: b1) capsaicin or a capsacinoid derived from Capsicum genus or a Capsicum extract containing capsaicin and/or capsacinoids; b2) a sulphur containing active principle derived from the Allium genus or an Allium extract containing it; b3) a catechin active substance derived from the genus Camellia or a Camellia extract containing it. The menthol and mint essential oil have a potentiating action on the biological activities of the other aforementioned components.