Abstract: Product with lipolytic activity and its method preparation.The present invention relates to a process for preparing a sea-weed based product with lipolytic activity. Said process consists of subjecting sea-weed to the following stages:a) rehydration of previously lyophilized sea-weed to the original level of humidity with demineralized water,b) lixiviation in semi-fluid bed of the rehydrated sea-weed,c) elimination from the extraction juice of the macromolecules and particles which are greater in size than 0.22 micron,d) concentration of the organic elements by eliminating the minerals.