A product dispensing machine, comprising: - a support frame defining internally thereof a housing chamber for the products to be dispensed and optionally exhibiting a wall provided with at least a transparent portion for a visual access to the products; - a magazine located in the housing chamber and provided with a predetermined number of planes for containing the products to be distributed; - a collecting compartment of the product released associated to the support frame for enabling collection of the product; - a plurality of spiral dispensers associated to respective planes, the spiral dispensers comprising successive spires and exhibiting a prevalent development direction directed along a rotation axis between a rear end and a front end for releasing, the spiral dispensers being destined to house the products to be dispensed interposed between successive spires and resting on the plane; - at least a movement device for selectively generating a rotating motion of at least a spiral dispenser of the spiral dispensers about the respective rotation axis, the rotary motion causing an advancement of the products to be dispensed interposed between successive spires towards the front release end, a product interposed between successive spires being released at the release end, said product dispensing machine comprises a sensor of a presence of at least a product located between two spires of a spiral dispenser, the sensor being configured such as to determine a presence of a portion of the product at a central area of an area occupied by the spires located about the rotation axis, the machine being characterized in that, during the detecting stage, an active portion of the sensor is interposed between the frontal portion of the wall and the interior releasing end of the spiral dispenser, the sensor comprising an optical sensor, destined to send a signal towards the central area of occupation of the spires and such as to receive an eventual signal reflected by a product which is present there. - a support frame defining internally thereof a housing chamber for the products to be dispensed and optionally exhibiting a wall provided with at least a transparent portion for a visual access to the products; - a magazine located in the housing chamber and provided with a predetermined number of planes for containing the products to be distributed; - a collecting compartment of the product released associated to the support frame for enabling collection of the product; - a plurality of spiral dispensers associated to respective planes, the spiral dispensers comprising successive spires and exhibiting a prevalent development direction directed along a rotation axis between a rear end and a front end for releasing, the spiral dispensers being destined to house the products to be dispensed interposed between successive spires and resting on the plane; - at least a movement device for selectively generating a rotating motion of at least a spiral dispenser of the spiral dispensers about the respective rotation axis, the rotary motion causing an advancement of the products to be dispensed interposed between successive spires towards the front release end, a product interposed between successive spires being released at the release end, said product dispensing machine comprises a sensor of a presence of at least a product located between two spires of a spiral dispenser, the sensor being configured such as to determine a presence of a portion of the product at a central area of an area occupied by the spires located about the rotation axis, the machine being characterized in that, during the detecting stage, an active portion of the sensor is interposed between the frontal portion of the wall and the interior releasing end of the spiral dispenser, the sensor comprising an optical sensor, destined to send a signal towards the central area of occupation of the spires and such as to receive an eventual signal reflected by a product which is present there.