Abstract: The specification discloses a dispenser for automatically mixing controlled amounts of liquid additive to the shower water. The dispenser is attachable to the water inlet pipe of an ordinary shower head and includes a plastic refillable container for holding the liquid additive and dispensing it under the flow of gravity. A valve is positioned over the mouth of the receptacle for controlling the flow of liquid additive. A dispensing tube assembly communicates with the valve for allowing liquid additive to flow by gravity to a portion of the dispensing tube extending subjacent the nozzles of the shower head. A first series of discharge openings along the bottom portion of the dispensing tube assembly drips a continuous flow of liquid additive into the stream of shower water after it exits from the nozzle.