The invention relates to the cosmetic use, as a deodorant active agent, of spiculisporic acid in free form, partially or fully neutralised by at least one mineral and/or organic base. The invention also relates to a cosmetic method for treating human body odours, in particular the armpits or feet, in which at least one spiculisporic acid as defined above or a composition containing same in a physiologically acceptable medium is applied to the human keratin material.