A dosing device for feeding infusion products including a dosing drum rotating about an axis and positioned between a continuous strip of filter material, movable along a feed direction, and a primary hopper for containing a primary infusion product; the dosing drum has a plurality of radial chambers for receiving a first dose of primary infusion product from the primary hopper and for releasing the first dose of primary infusion product above the strip of filter material; the device also includes an independent dosing unit of a secondary product including controlled release elements configured for depositing a second dose of secondary product to define a mixed dose of primary product and secondary product.