A capsule, including: a casing containing an initial product to be joined to a fluid for making a final product; a nozzle associated with the casing and having a longitudinal side wall and a first end provided with a first opening suitable to engage a fluid injecting arrangement of a brewing machine, said longitudinal side wall being provided with at least one outflow opening connected to the first opening through a first duct for dispensing said fluid in the cavity in a injecting step; and a mixing element rotatably coupled with the nozzle at the outflow opening and shaped in such a manner as to divert at least one jet of fluid coming from the outflow opening and be rotated by said jet around said nozzle so as to create inside said cavity a vortex flow of fluid and product.